From b00e0ae442c44f826d62ec753bffea3b392af96a Mon Sep 17 00:00:00 2001
From: Giacomo Cavalieri <giacomo.cavalieri@icloud.com>
Date: Mon, 21 Oct 2024 16:22:17 +0200
Subject: [PATCH] replace io.debug with echo

---
 .../chapter0_basics/lesson05_ints/code.gleam  | 27 +++++++++----------
 .../lesson06_floats/code.gleam                | 27 +++++++++----------
 .../lesson07_number_formats/code.gleam        | 16 +++++------
 .../lesson08_equality/code.gleam              |  6 ++---
 .../lesson09_strings/code.gleam               | 12 ++++-----
 .../chapter0_basics/lesson10_bools/code.gleam | 13 +++++----
 .../lesson11_assignments/code.gleam           |  8 +++---
 .../lesson15_type_aliases/code.gleam          |  4 +--
 .../lesson16_blocks/code.gleam                |  6 ++---
 .../chapter0_basics/lesson17_lists/code.gleam | 10 +++----
 .../lesson18_constants/code.gleam             | 10 +++----
 .../lesson00_functions/code.gleam             |  4 +--
 .../code.gleam                                |  6 ++---
 .../lesson04_anonymous_functions/code.gleam   |  8 +++---
 .../lesson05_function_captures/code.gleam     |  6 ++---
 .../lesson06_generic_functions/code.gleam     |  6 ++---
 .../lesson07_pipelines/code.gleam             |  6 ++---
 .../lesson08_labelled_arguments/code.gleam    |  8 +++---
 .../lesson01_case_expressions/code.gleam      |  5 ++--
 .../lesson02_variable_patterns/code.gleam     |  3 +--
 .../lesson03_string_patterns/code.gleam       |  8 +++---
 .../lesson04_list_patterns/code.gleam         |  5 ++--
 .../lesson05_recursion/code.gleam             |  6 ++---
 .../lesson06_tail_calls/code.gleam            |  6 ++---
 .../lesson07_list_recursion/code.gleam        |  4 +--
 .../lesson08_multiple_subjects/code.gleam     |  7 +++--
 .../lesson09_alternative_patterns/code.gleam  |  5 ++--
 .../lesson10_pattern_aliases/code.gleam       |  8 +++---
 .../lesson11_guards/code.gleam                |  4 +--
 .../lesson00_tuples/code.gleam                |  8 +++---
 .../lesson01_custom_types/code.gleam          |  6 ++---
 .../lesson02_records/code.gleam               |  4 +--
 .../lesson03_record_accessors/code.gleam      |  8 +++---
 .../code.gleam                                |  2 +-
 .../lesson05_record_updates/code.gleam        |  6 ++---
 .../lesson07_nil/code.gleam                   |  4 +--
 .../lesson08_results/code.gleam               |  9 +++----
 .../lesson09_bit_arrays/code.gleam            | 12 ++++-----
 .../lesson01_list_module/code.gleam           | 10 +++----
 .../lesson02_result_module/code.gleam         | 16 +++++------
 .../lesson03_dict_module/code.gleam           |  5 ++--
 .../lesson04_option_module/code.gleam         |  5 ++--
 .../lesson00_opaque_types/code.gleam          |  8 +++---
 .../lesson01_use/code.gleam                   |  5 ++--
 .../lesson05_let_assert/code.gleam            |  6 ++---
 .../lesson06_externals/code.gleam             |  4 +--
 .../code.gleam                                |  4 +--
 .../code.gleam                                |  6 ++---
 48 files changed, 152 insertions(+), 220 deletions(-)

diff --git a/src/content/chapter0_basics/lesson05_ints/code.gleam b/src/content/chapter0_basics/lesson05_ints/code.gleam
index 120b342..708a444 100644
--- a/src/content/chapter0_basics/lesson05_ints/code.gleam
+++ b/src/content/chapter0_basics/lesson05_ints/code.gleam
@@ -1,25 +1,24 @@
 import gleam/int
-import gleam/io
 
 pub fn main() {
   // Int arithmetic
-  io.debug(1 + 1)
-  io.debug(5 - 1)
-  io.debug(5 / 2)
-  io.debug(3 * 3)
-  io.debug(5 % 2)
+  echo { 1 + 1 }
+  echo { 5 - 1 }
+  echo { 5 / 2 }
+  echo { 3 * 3 }
+  echo { 5 % 2 }
 
   // Int comparisons
-  io.debug(2 > 1)
-  io.debug(2 < 1)
-  io.debug(2 >= 1)
-  io.debug(2 <= 1)
+  echo { 2 > 1 }
+  echo { 2 < 1 }
+  echo { 2 >= 1 }
+  echo { 2 <= 1 }
 
   // Equality works for any type
-  io.debug(1 == 1)
-  io.debug(2 == 1)
+  echo { 1 == 1 }
+  echo { 2 == 1 }
 
   // Standard library int functions
-  io.debug(int.max(42, 77))
-  io.debug(int.clamp(5, 10, 20))
+  echo int.max(42, 77)
+  echo int.clamp(5, 10, 20)
 }
diff --git a/src/content/chapter0_basics/lesson06_floats/code.gleam b/src/content/chapter0_basics/lesson06_floats/code.gleam
index b56eb3a..1a65b6a 100644
--- a/src/content/chapter0_basics/lesson06_floats/code.gleam
+++ b/src/content/chapter0_basics/lesson06_floats/code.gleam
@@ -1,27 +1,26 @@
 import gleam/float
-import gleam/io
 
 pub fn main() {
   // Float arithmetic
-  io.debug(1.0 +. 1.5)
-  io.debug(5.0 -. 1.5)
-  io.debug(5.0 /. 2.5)
-  io.debug(3.0 *. 3.5)
+  echo { 1.0 +. 1.5 }
+  echo { 5.0 -. 1.5 }
+  echo { 5.0 /. 2.5 }
+  echo { 3.0 *. 3.5 }
 
   // Float comparisons
-  io.debug(2.2 >. 1.3)
-  io.debug(2.2 <. 1.3)
-  io.debug(2.2 >=. 1.3)
-  io.debug(2.2 <=. 1.3)
+  echo { 2.2 >. 1.3 }
+  echo { 2.2 <. 1.3 }
+  echo { 2.2 >=. 1.3 }
+  echo { 2.2 <=. 1.3 }
 
   // Equality works for any type
-  io.debug(1.1 == 1.1)
-  io.debug(2.1 == 1.2)
+  echo { 1.1 == 1.1 }
+  echo { 2.1 == 1.2 }
 
   // Division by zero is not an error
-  io.debug(3.14 /. 0.0)
+  echo { 3.14 /. 0.0 }
 
   // Standard library float functions
-  io.debug(float.max(2.0, 9.5))
-  io.debug(float.ceiling(5.4))
+  echo float.max(2.0, 9.5)
+  echo float.ceiling(5.4)
 }
diff --git a/src/content/chapter0_basics/lesson07_number_formats/code.gleam b/src/content/chapter0_basics/lesson07_number_formats/code.gleam
index 7307185..4d2939e 100644
--- a/src/content/chapter0_basics/lesson07_number_formats/code.gleam
+++ b/src/content/chapter0_basics/lesson07_number_formats/code.gleam
@@ -1,16 +1,14 @@
-import gleam/io
-
 pub fn main() {
   // Underscores
-  io.debug(1_000_000)
-  io.debug(10_000.01)
+  echo 1_000_000
+  echo 10_000.01
 
   // Binary, octal, and hex Int literals
-  io.debug(0b00001111)
-  io.debug(0o17)
-  io.debug(0xF)
+  echo 0b00001111
+  echo 0o17
+  echo 0xF
 
   // Scientific notation Float literals
-  io.debug(7.0e7)
-  io.debug(3.0e-4)
+  echo 7.0e7
+  echo 3.0e-4
 }
diff --git a/src/content/chapter0_basics/lesson08_equality/code.gleam b/src/content/chapter0_basics/lesson08_equality/code.gleam
index 70a2b89..ae65e81 100644
--- a/src/content/chapter0_basics/lesson08_equality/code.gleam
+++ b/src/content/chapter0_basics/lesson08_equality/code.gleam
@@ -1,6 +1,4 @@
-import gleam/io
-
 pub fn main() {
-  io.debug(100 == 100)
-  io.debug(1.5 != 0.1)
+  echo { 100 == 100 }
+  echo { 1.5 != 0.1 }
 }
diff --git a/src/content/chapter0_basics/lesson09_strings/code.gleam b/src/content/chapter0_basics/lesson09_strings/code.gleam
index ea47e0f..96756be 100644
--- a/src/content/chapter0_basics/lesson09_strings/code.gleam
+++ b/src/content/chapter0_basics/lesson09_strings/code.gleam
@@ -3,21 +3,21 @@ import gleam/string
 
 pub fn main() {
   // String literals
-  io.debug("👩‍💻 こんにちは Gleam 🏳️‍🌈")
-  io.debug(
+  io.println("👩‍💻 こんにちは Gleam 🏳️‍🌈")
+  io.println(
     "multi
     line
     string",
   )
-  io.debug("\u{1F600}")
+  io.println("\u{1F600}")
 
   // Double quote can be escaped
   io.println("\"X\" marks the spot")
 
   // String concatenation
-  io.debug("One " <> "Two")
+  io.println("One " <> "Two")
 
   // String functions
-  io.debug(string.reverse("1 2 3 4 5"))
-  io.debug(string.append("abc", "def"))
+  io.println(string.reverse("1 2 3 4 5"))
+  io.println(string.append("abc", "def"))
 }
diff --git a/src/content/chapter0_basics/lesson10_bools/code.gleam b/src/content/chapter0_basics/lesson10_bools/code.gleam
index aa25ba2..e084863 100644
--- a/src/content/chapter0_basics/lesson10_bools/code.gleam
+++ b/src/content/chapter0_basics/lesson10_bools/code.gleam
@@ -1,14 +1,13 @@
 import gleam/bool
-import gleam/io
 
 pub fn main() {
   // Bool operators
-  io.debug(True && False)
-  io.debug(True && True)
-  io.debug(False || False)
-  io.debug(False || True)
+  echo { True && False }
+  echo { True && True }
+  echo { False || False }
+  echo { False || True }
 
   // Bool functions
-  io.debug(bool.to_string(True))
-  io.debug(bool.to_int(False))
+  echo bool.to_string(True)
+  echo bool.to_int(False)
 }
diff --git a/src/content/chapter0_basics/lesson11_assignments/code.gleam b/src/content/chapter0_basics/lesson11_assignments/code.gleam
index a030e43..dfb092b 100644
--- a/src/content/chapter0_basics/lesson11_assignments/code.gleam
+++ b/src/content/chapter0_basics/lesson11_assignments/code.gleam
@@ -2,16 +2,16 @@ import gleam/io
 
 pub fn main() {
   let x = "Original"
-  io.debug(x)
+  io.println(x)
 
   // Assign `y` to the value of `x`
   let y = x
-  io.debug(y)
+  io.println(y)
 
   // Assign `x` to a new value
   let x = "New"
-  io.debug(x)
+  io.println(x)
 
   // The `y` still refers to the original value
-  io.debug(y)
+  io.println(y)
 }
diff --git a/src/content/chapter0_basics/lesson15_type_aliases/code.gleam b/src/content/chapter0_basics/lesson15_type_aliases/code.gleam
index 6125ffe..5eecedf 100644
--- a/src/content/chapter0_basics/lesson15_type_aliases/code.gleam
+++ b/src/content/chapter0_basics/lesson15_type_aliases/code.gleam
@@ -1,5 +1,3 @@
-import gleam/io
-
 pub type UserId =
   Int
 
@@ -8,5 +6,5 @@ pub fn main() {
   let two: Int = 2
 
   // UserId and Int are the same type
-  io.debug(one == two)
+  echo { one == two }
 }
diff --git a/src/content/chapter0_basics/lesson16_blocks/code.gleam b/src/content/chapter0_basics/lesson16_blocks/code.gleam
index 31e4729..0d429df 100644
--- a/src/content/chapter0_basics/lesson16_blocks/code.gleam
+++ b/src/content/chapter0_basics/lesson16_blocks/code.gleam
@@ -1,13 +1,11 @@
-import gleam/io
-
 pub fn main() {
   let fahrenheit = {
     let degrees = 64
     degrees
   }
-  // io.debug(degrees) // <- This will not compile
+  // echo degrees // <- This will not compile
 
   // Changing order of evaluation
   let celsius = { fahrenheit - 32 } * 5 / 9
-  io.debug(celsius)
+  echo celsius
 }
diff --git a/src/content/chapter0_basics/lesson17_lists/code.gleam b/src/content/chapter0_basics/lesson17_lists/code.gleam
index 646ad6e..b6f2f0a 100644
--- a/src/content/chapter0_basics/lesson17_lists/code.gleam
+++ b/src/content/chapter0_basics/lesson17_lists/code.gleam
@@ -1,16 +1,14 @@
-import gleam/io
-
 pub fn main() {
   let ints = [1, 2, 3]
 
-  io.debug(ints)
+  echo ints
 
   // Immutably prepend
-  io.debug([-1, 0, ..ints])
+  echo [-1, 0, ..ints]
 
   // Uncomment this to see the error
-  // io.debug(["zero", ..ints])
+  // echo ["zero", ..ints]
 
   // The original lists are unchanged
-  io.debug(ints)
+  echo ints
 }
diff --git a/src/content/chapter0_basics/lesson18_constants/code.gleam b/src/content/chapter0_basics/lesson18_constants/code.gleam
index aed6fb0..7a43abc 100644
--- a/src/content/chapter0_basics/lesson18_constants/code.gleam
+++ b/src/content/chapter0_basics/lesson18_constants/code.gleam
@@ -1,13 +1,11 @@
-import gleam/io
-
 const ints: List(Int) = [1, 2, 3]
 
 const floats = [1.0, 2.0, 3.0]
 
 pub fn main() {
-  io.debug(ints)
-  io.debug(ints == [1, 2, 3])
+  echo ints
+  echo { ints == [1, 2, 3] }
 
-  io.debug(floats)
-  io.debug(floats == [1.0, 2.0, 3.0])
+  echo floats
+  echo { floats == [1.0, 2.0, 3.0] }
 }
diff --git a/src/content/chapter1_functions/lesson00_functions/code.gleam b/src/content/chapter1_functions/lesson00_functions/code.gleam
index 220e58d..34e561e 100644
--- a/src/content/chapter1_functions/lesson00_functions/code.gleam
+++ b/src/content/chapter1_functions/lesson00_functions/code.gleam
@@ -1,7 +1,5 @@
-import gleam/io
-
 pub fn main() {
-  io.debug(double(10))
+  echo double(10)
 }
 
 fn double(a: Int) -> Int {
diff --git a/src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam b/src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam
index 43b6ca4..71e7fbf 100644
--- a/src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam
+++ b/src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam
@@ -1,12 +1,10 @@
-import gleam/io
-
 pub fn main() {
   // Call a function with another function
-  io.debug(twice(1, add_one))
+  echo twice(1, add_one)
 
   // Functions can be assigned to variables
   let my_function = add_one
-  io.debug(my_function(100))
+  echo my_function(100)
 }
 
 fn twice(argument: Int, passed_function: fn(Int) -> Int) -> Int {
diff --git a/src/content/chapter1_functions/lesson04_anonymous_functions/code.gleam b/src/content/chapter1_functions/lesson04_anonymous_functions/code.gleam
index df7a6f9..6a2ebb0 100644
--- a/src/content/chapter1_functions/lesson04_anonymous_functions/code.gleam
+++ b/src/content/chapter1_functions/lesson04_anonymous_functions/code.gleam
@@ -1,17 +1,15 @@
-import gleam/io
-
 pub fn main() {
   // Assign an anonymous function to a variable
   let add_one = fn(a) { a + 1 }
-  io.debug(twice(1, add_one))
+  echo twice(1, add_one)
 
   // Pass an anonymous function as an argument
-  io.debug(twice(1, fn(a) { a * 2 }))
+  echo twice(1, fn(a) { a * 2 })
 
   let secret_number = 42
   // This anonymous function always returns 42
   let secret = fn() { secret_number }
-  io.debug(secret())
+  echo secret()
 }
 
 fn twice(argument: Int, my_function: fn(Int) -> Int) -> Int {
diff --git a/src/content/chapter1_functions/lesson05_function_captures/code.gleam b/src/content/chapter1_functions/lesson05_function_captures/code.gleam
index 35f3412..0fd90fc 100644
--- a/src/content/chapter1_functions/lesson05_function_captures/code.gleam
+++ b/src/content/chapter1_functions/lesson05_function_captures/code.gleam
@@ -1,12 +1,10 @@
-import gleam/io
-
 pub fn main() {
   // These two statements are equivalent
   let add_one_v1 = fn(x) { add(1, x) }
   let add_one_v2 = add(1, _)
 
-  io.debug(add_one_v1(10))
-  io.debug(add_one_v2(10))
+  echo add_one_v1(10)
+  echo add_one_v2(10)
 }
 
 fn add(a: Int, b: Int) -> Int {
diff --git a/src/content/chapter1_functions/lesson06_generic_functions/code.gleam b/src/content/chapter1_functions/lesson06_generic_functions/code.gleam
index db53efe..128ae2e 100644
--- a/src/content/chapter1_functions/lesson06_generic_functions/code.gleam
+++ b/src/content/chapter1_functions/lesson06_generic_functions/code.gleam
@@ -1,5 +1,3 @@
-import gleam/io
-
 pub fn main() {
   let add_one = fn(x) { x + 1 }
   let exclaim = fn(x) { x <> "!" }
@@ -8,10 +6,10 @@ pub fn main() {
   // twice(10, exclaim)
 
   // Here the type variable is replaced by the type Int
-  io.debug(twice(10, add_one))
+  echo twice(10, add_one)
 
   // Here the type variable is replaced by the type String
-  io.debug(twice("Hello", exclaim))
+  echo twice("Hello", exclaim)
 }
 
 // The name `value` refers to the same type multiple times
diff --git a/src/content/chapter1_functions/lesson07_pipelines/code.gleam b/src/content/chapter1_functions/lesson07_pipelines/code.gleam
index ec9b805..5156cb1 100644
--- a/src/content/chapter1_functions/lesson07_pipelines/code.gleam
+++ b/src/content/chapter1_functions/lesson07_pipelines/code.gleam
@@ -3,17 +3,17 @@ import gleam/string
 
 pub fn main() {
   // Without the pipe operator
-  io.debug(string.drop_left(string.drop_right("Hello, Joe!", 1), 7))
+  io.println(string.drop_left(string.drop_right("Hello, Joe!", 1), 7))
 
   // With the pipe operator
   "Hello, Mike!"
   |> string.drop_right(1)
   |> string.drop_left(7)
-  |> io.debug
+  |> io.println
 
   // Changing order with function capturing
   "1"
   |> string.append("2")
   |> string.append("3", _)
-  |> io.debug
+  |> io.println
 }
diff --git a/src/content/chapter1_functions/lesson08_labelled_arguments/code.gleam b/src/content/chapter1_functions/lesson08_labelled_arguments/code.gleam
index 25bb8c1..0a23890 100644
--- a/src/content/chapter1_functions/lesson08_labelled_arguments/code.gleam
+++ b/src/content/chapter1_functions/lesson08_labelled_arguments/code.gleam
@@ -1,14 +1,12 @@
-import gleam/io
-
 pub fn main() {
   // Without using labels
-  io.debug(calculate(1, 2, 3))
+  echo calculate(1, 2, 3)
 
   // Using the labels
-  io.debug(calculate(1, add: 2, multiply: 3))
+  echo calculate(1, add: 2, multiply: 3)
 
   // Using the labels in a different order
-  io.debug(calculate(1, multiply: 3, add: 2))
+  echo calculate(1, multiply: 3, add: 2)
 }
 
 fn calculate(value: Int, add addend: Int, multiply multiplier: Int) {
diff --git a/src/content/chapter2_flow_control/lesson01_case_expressions/code.gleam b/src/content/chapter2_flow_control/lesson01_case_expressions/code.gleam
index d198832..f951588 100644
--- a/src/content/chapter2_flow_control/lesson01_case_expressions/code.gleam
+++ b/src/content/chapter2_flow_control/lesson01_case_expressions/code.gleam
@@ -1,9 +1,8 @@
 import gleam/int
-import gleam/io
 
 pub fn main() {
   let x = int.random(5)
-  io.debug(x)
+  echo x
 
   let result = case x {
     // Match specific values
@@ -13,5 +12,5 @@ pub fn main() {
     // Match any other value
     _ -> "Other"
   }
-  io.debug(result)
+  echo result
 }
diff --git a/src/content/chapter2_flow_control/lesson02_variable_patterns/code.gleam b/src/content/chapter2_flow_control/lesson02_variable_patterns/code.gleam
index 5bce937..eb2a5a2 100644
--- a/src/content/chapter2_flow_control/lesson02_variable_patterns/code.gleam
+++ b/src/content/chapter2_flow_control/lesson02_variable_patterns/code.gleam
@@ -1,5 +1,4 @@
 import gleam/int
-import gleam/io
 
 pub fn main() {
   let result = case int.random(5) {
@@ -10,5 +9,5 @@ pub fn main() {
     // Match any other value and assign it to a variable
     other -> "It is " <> int.to_string(other)
   }
-  io.debug(result)
+  echo result
 }
diff --git a/src/content/chapter2_flow_control/lesson03_string_patterns/code.gleam b/src/content/chapter2_flow_control/lesson03_string_patterns/code.gleam
index d1441a0..788c04a 100644
--- a/src/content/chapter2_flow_control/lesson03_string_patterns/code.gleam
+++ b/src/content/chapter2_flow_control/lesson03_string_patterns/code.gleam
@@ -1,9 +1,7 @@
-import gleam/io
-
 pub fn main() {
-  io.debug(get_name("Hello, Joe"))
-  io.debug(get_name("Hello, Mike"))
-  io.debug(get_name("System still working?"))
+  echo get_name("Hello, Joe")
+  echo get_name("Hello, Mike")
+  echo get_name("System still working?")
 }
 
 fn get_name(x: String) -> String {
diff --git a/src/content/chapter2_flow_control/lesson04_list_patterns/code.gleam b/src/content/chapter2_flow_control/lesson04_list_patterns/code.gleam
index 1b71feb..1b8cbd4 100644
--- a/src/content/chapter2_flow_control/lesson04_list_patterns/code.gleam
+++ b/src/content/chapter2_flow_control/lesson04_list_patterns/code.gleam
@@ -1,10 +1,9 @@
 import gleam/int
-import gleam/io
 import gleam/list
 
 pub fn main() {
   let x = list.repeat(int.random(5), times: int.random(3))
-  io.debug(x)
+  echo x
 
   let result = case x {
     [] -> "Empty list"
@@ -13,5 +12,5 @@ pub fn main() {
     [_, _] -> "List of 2 elements"
     _ -> "Some other list"
   }
-  io.debug(result)
+  echo result
 }
diff --git a/src/content/chapter2_flow_control/lesson05_recursion/code.gleam b/src/content/chapter2_flow_control/lesson05_recursion/code.gleam
index 10d45ab..f0068b8 100644
--- a/src/content/chapter2_flow_control/lesson05_recursion/code.gleam
+++ b/src/content/chapter2_flow_control/lesson05_recursion/code.gleam
@@ -1,8 +1,6 @@
-import gleam/io
-
 pub fn main() {
-  io.debug(factorial(5))
-  io.debug(factorial(7))
+  echo factorial(5)
+  echo factorial(7)
 }
 
 // A recursive functions that calculates factorial
diff --git a/src/content/chapter2_flow_control/lesson06_tail_calls/code.gleam b/src/content/chapter2_flow_control/lesson06_tail_calls/code.gleam
index b0a416c..6a005bc 100644
--- a/src/content/chapter2_flow_control/lesson06_tail_calls/code.gleam
+++ b/src/content/chapter2_flow_control/lesson06_tail_calls/code.gleam
@@ -1,8 +1,6 @@
-import gleam/io
-
 pub fn main() {
-  io.debug(factorial(5))
-  io.debug(factorial(7))
+  echo factorial(5)
+  echo factorial(7)
 }
 
 pub fn factorial(x: Int) -> Int {
diff --git a/src/content/chapter2_flow_control/lesson07_list_recursion/code.gleam b/src/content/chapter2_flow_control/lesson07_list_recursion/code.gleam
index 370675a..d0561f0 100644
--- a/src/content/chapter2_flow_control/lesson07_list_recursion/code.gleam
+++ b/src/content/chapter2_flow_control/lesson07_list_recursion/code.gleam
@@ -1,8 +1,6 @@
-import gleam/io
-
 pub fn main() {
   let sum = sum_list([18, 56, 35, 85, 91], 0)
-  io.debug(sum)
+  echo sum
 }
 
 fn sum_list(list: List(Int), total: Int) -> Int {
diff --git a/src/content/chapter2_flow_control/lesson08_multiple_subjects/code.gleam b/src/content/chapter2_flow_control/lesson08_multiple_subjects/code.gleam
index 38885b6..fd41ba1 100644
--- a/src/content/chapter2_flow_control/lesson08_multiple_subjects/code.gleam
+++ b/src/content/chapter2_flow_control/lesson08_multiple_subjects/code.gleam
@@ -1,11 +1,10 @@
 import gleam/int
-import gleam/io
 
 pub fn main() {
   let x = int.random(2)
   let y = int.random(2)
-  io.debug(x)
-  io.debug(y)
+  echo x
+  echo y
 
   let result = case x, y {
     0, 0 -> "Both are zero"
@@ -13,5 +12,5 @@ pub fn main() {
     _, 0 -> "Second is zero"
     _, _ -> "Neither are zero"
   }
-  io.debug(result)
+  echo result
 }
diff --git a/src/content/chapter2_flow_control/lesson09_alternative_patterns/code.gleam b/src/content/chapter2_flow_control/lesson09_alternative_patterns/code.gleam
index e916a03..8545530 100644
--- a/src/content/chapter2_flow_control/lesson09_alternative_patterns/code.gleam
+++ b/src/content/chapter2_flow_control/lesson09_alternative_patterns/code.gleam
@@ -1,14 +1,13 @@
 import gleam/int
-import gleam/io
 
 pub fn main() {
   let number = int.random(10)
-  io.debug(number)
+  echo number
 
   let result = case number {
     2 | 4 | 6 | 8 -> "This is an even number"
     1 | 3 | 5 | 7 -> "This is an odd number"
     _ -> "I'm not sure"
   }
-  io.debug(result)
+  echo result
 }
diff --git a/src/content/chapter2_flow_control/lesson10_pattern_aliases/code.gleam b/src/content/chapter2_flow_control/lesson10_pattern_aliases/code.gleam
index ee40a26..134db5b 100644
--- a/src/content/chapter2_flow_control/lesson10_pattern_aliases/code.gleam
+++ b/src/content/chapter2_flow_control/lesson10_pattern_aliases/code.gleam
@@ -1,9 +1,7 @@
-import gleam/io
-
 pub fn main() {
-  io.debug(get_first_non_empty([[], [1, 2, 3], [4, 5]]))
-  io.debug(get_first_non_empty([[1, 2], [3, 4, 5], []]))
-  io.debug(get_first_non_empty([[], [], []]))
+  echo get_first_non_empty([[], [1, 2, 3], [4, 5]])
+  echo get_first_non_empty([[1, 2], [3, 4, 5], []])
+  echo get_first_non_empty([[], [], []])
 }
 
 fn get_first_non_empty(lists: List(List(t))) -> List(t) {
diff --git a/src/content/chapter2_flow_control/lesson11_guards/code.gleam b/src/content/chapter2_flow_control/lesson11_guards/code.gleam
index e655aef..86a6854 100644
--- a/src/content/chapter2_flow_control/lesson11_guards/code.gleam
+++ b/src/content/chapter2_flow_control/lesson11_guards/code.gleam
@@ -2,8 +2,8 @@ import gleam/io
 
 pub fn main() {
   let numbers = [1, 2, 3, 4, 5]
-  io.debug(get_first_larger(numbers, 3))
-  io.debug(get_first_larger(numbers, 5))
+  echo get_first_larger(numbers, 3)
+  echo get_first_larger(numbers, 5)
 }
 
 fn get_first_larger(numbers: List(Int), limit: Int) -> Int {
diff --git a/src/content/chapter3_data_types/lesson00_tuples/code.gleam b/src/content/chapter3_data_types/lesson00_tuples/code.gleam
index d5c6313..dab4513 100644
--- a/src/content/chapter3_data_types/lesson00_tuples/code.gleam
+++ b/src/content/chapter3_data_types/lesson00_tuples/code.gleam
@@ -1,10 +1,8 @@
-import gleam/io
-
 pub fn main() {
   let triple = #(1, 2.2, "three")
-  io.debug(triple)
+  echo triple
 
   let #(a, _, _) = triple
-  io.debug(a)
-  io.debug(triple.1)
+  echo a
+  echo triple.1
 }
diff --git a/src/content/chapter3_data_types/lesson01_custom_types/code.gleam b/src/content/chapter3_data_types/lesson01_custom_types/code.gleam
index 35629bf..91fb60b 100644
--- a/src/content/chapter3_data_types/lesson01_custom_types/code.gleam
+++ b/src/content/chapter3_data_types/lesson01_custom_types/code.gleam
@@ -1,5 +1,3 @@
-import gleam/io
-
 pub type Season {
   Spring
   Summer
@@ -8,8 +6,8 @@ pub type Season {
 }
 
 pub fn main() {
-  io.debug(weather(Spring))
-  io.debug(weather(Autumn))
+  echo weather(Spring)
+  echo weather(Autumn)
 }
 
 fn weather(season: Season) -> String {
diff --git a/src/content/chapter3_data_types/lesson02_records/code.gleam b/src/content/chapter3_data_types/lesson02_records/code.gleam
index bd6da3c..64ed7be 100644
--- a/src/content/chapter3_data_types/lesson02_records/code.gleam
+++ b/src/content/chapter3_data_types/lesson02_records/code.gleam
@@ -1,5 +1,3 @@
-import gleam/io
-
 pub type SchoolPerson {
   Teacher(name: String, subject: String)
   Student(String)
@@ -13,5 +11,5 @@ pub fn main() {
   let student3 = Student("Shaheer")
 
   let school = [teacher1, teacher2, student1, student2, student3]
-  io.debug(school)
+  echo school
 }
diff --git a/src/content/chapter3_data_types/lesson03_record_accessors/code.gleam b/src/content/chapter3_data_types/lesson03_record_accessors/code.gleam
index 63ca721..bb9d847 100644
--- a/src/content/chapter3_data_types/lesson03_record_accessors/code.gleam
+++ b/src/content/chapter3_data_types/lesson03_record_accessors/code.gleam
@@ -1,5 +1,3 @@
-import gleam/io
-
 pub type SchoolPerson {
   Teacher(name: String, subject: String)
   Student(name: String)
@@ -9,7 +7,7 @@ pub fn main() {
   let teacher = Teacher("Mr Schofield", "Physics")
   let student = Student("Koushiar")
 
-  io.debug(teacher.name)
-  io.debug(student.name)
-  // io.debug(teacher.subject)
+  echo teacher.name
+  echo student.name
+  // echo teacher.subject
 }
diff --git a/src/content/chapter3_data_types/lesson04_record_pattern_matching/code.gleam b/src/content/chapter3_data_types/lesson04_record_pattern_matching/code.gleam
index 3ef27b2..c648d50 100644
--- a/src/content/chapter3_data_types/lesson04_record_pattern_matching/code.gleam
+++ b/src/content/chapter3_data_types/lesson04_record_pattern_matching/code.gleam
@@ -21,5 +21,5 @@ pub fn main() {
   // if the custom type has a single variant you can
   // destructure it using `let` instead of a case expression!
   let IceCream(flavour) = favourite_ice_cream
-  io.debug(flavour)
+  echo flavour
 }
diff --git a/src/content/chapter3_data_types/lesson05_record_updates/code.gleam b/src/content/chapter3_data_types/lesson05_record_updates/code.gleam
index ed7b45b..2237723 100644
--- a/src/content/chapter3_data_types/lesson05_record_updates/code.gleam
+++ b/src/content/chapter3_data_types/lesson05_record_updates/code.gleam
@@ -1,5 +1,3 @@
-import gleam/io
-
 pub type SchoolPerson {
   Teacher(name: String, subject: String, floor: Int, room: Int)
 }
@@ -10,6 +8,6 @@ pub fn main() {
   // Use the update syntax
   let teacher2 = Teacher(..teacher1, subject: "PE", room: 6)
 
-  io.debug(teacher1)
-  io.debug(teacher2)
+  echo teacher1
+  echo teacher2
 }
diff --git a/src/content/chapter3_data_types/lesson07_nil/code.gleam b/src/content/chapter3_data_types/lesson07_nil/code.gleam
index c28080b..b69d654 100644
--- a/src/content/chapter3_data_types/lesson07_nil/code.gleam
+++ b/src/content/chapter3_data_types/lesson07_nil/code.gleam
@@ -2,10 +2,10 @@ import gleam/io
 
 pub fn main() {
   let x = Nil
-  io.debug(x)
+  echo x
 
   // let y: List(String) = Nil
 
   let result = io.println("Hello!")
-  io.debug(result == Nil)
+  echo { result == Nil }
 }
diff --git a/src/content/chapter3_data_types/lesson08_results/code.gleam b/src/content/chapter3_data_types/lesson08_results/code.gleam
index 67a2559..3938e54 100644
--- a/src/content/chapter3_data_types/lesson08_results/code.gleam
+++ b/src/content/chapter3_data_types/lesson08_results/code.gleam
@@ -1,11 +1,10 @@
 import gleam/int
-import gleam/io
 
 pub fn main() {
-  let _ = io.debug(buy_pastry(10))
-  let _ = io.debug(buy_pastry(8))
-  let _ = io.debug(buy_pastry(5))
-  let _ = io.debug(buy_pastry(3))
+  let _ = echo buy_pastry(10)
+  let _ = echo buy_pastry(8)
+  let _ = echo buy_pastry(5)
+  let _ = echo buy_pastry(3)
 }
 
 pub type PurchaseError {
diff --git a/src/content/chapter3_data_types/lesson09_bit_arrays/code.gleam b/src/content/chapter3_data_types/lesson09_bit_arrays/code.gleam
index 52d7b8c..d437c3c 100644
--- a/src/content/chapter3_data_types/lesson09_bit_arrays/code.gleam
+++ b/src/content/chapter3_data_types/lesson09_bit_arrays/code.gleam
@@ -1,18 +1,16 @@
-import gleam/io
-
 pub fn main() {
   // 8 bit int. In binary: 00000011
-  io.debug(<<3>>)
-  io.debug(<<3>> == <<3:size(8)>>)
+  echo <<3>>
+  echo { <<3>> == <<3:size(8)>> }
 
   // 16 bit int. In binary: 0001100000000011
-  io.debug(<<6147:size(16)>>)
+  echo <<6147:size(16)>>
 
   // A bit array of UTF8 data
-  io.debug(<<"Hello, Joe!":utf8>>)
+  echo <<"Hello, Joe!":utf8>>
 
   // Concatenation
   let first = <<4>>
   let second = <<2>>
-  io.debug(<<first:bits, second:bits>>)
+  echo <<first:bits, second:bits>>
 }
diff --git a/src/content/chapter4_standard_library/lesson01_list_module/code.gleam b/src/content/chapter4_standard_library/lesson01_list_module/code.gleam
index ab08ab1..ac90487 100644
--- a/src/content/chapter4_standard_library/lesson01_list_module/code.gleam
+++ b/src/content/chapter4_standard_library/lesson01_list_module/code.gleam
@@ -5,15 +5,15 @@ pub fn main() {
   let ints = [0, 1, 2, 3, 4, 5]
 
   io.println("=== map ===")
-  io.debug(list.map(ints, fn(x) { x * 2 }))
+  echo list.map(ints, fn(x) { x * 2 })
 
   io.println("=== filter ===")
-  io.debug(list.filter(ints, fn(x) { x % 2 == 0 }))
+  echo list.filter(ints, fn(x) { x % 2 == 0 })
 
   io.println("=== fold ===")
-  io.debug(list.fold(ints, 0, fn(count, e) { count + e }))
+  echo list.fold(ints, 0, fn(count, e) { count + e })
 
   io.println("=== find ===")
-  let _ = io.debug(list.find(ints, fn(x) { x > 3 }))
-  io.debug(list.find(ints, fn(x) { x > 13 }))
+  let _ = echo list.find(ints, fn(x) { x > 3 })
+  echo list.find(ints, fn(x) { x > 13 })
 }
diff --git a/src/content/chapter4_standard_library/lesson02_result_module/code.gleam b/src/content/chapter4_standard_library/lesson02_result_module/code.gleam
index 423938a..083a7ff 100644
--- a/src/content/chapter4_standard_library/lesson02_result_module/code.gleam
+++ b/src/content/chapter4_standard_library/lesson02_result_module/code.gleam
@@ -4,21 +4,21 @@ import gleam/result
 
 pub fn main() {
   io.println("=== map ===")
-  let _ = io.debug(result.map(Ok(1), fn(x) { x * 2 }))
-  let _ = io.debug(result.map(Error(1), fn(x) { x * 2 }))
+  let _ = echo result.map(Ok(1), fn(x) { x * 2 })
+  let _ = echo result.map(Error(1), fn(x) { x * 2 })
 
   io.println("=== try ===")
-  let _ = io.debug(result.try(Ok("1"), int.parse))
-  let _ = io.debug(result.try(Ok("no"), int.parse))
-  let _ = io.debug(result.try(Error(Nil), int.parse))
+  let _ = echo result.try(Ok("1"), int.parse)
+  let _ = echo result.try(Ok("no"), int.parse)
+  let _ = echo result.try(Error(Nil), int.parse)
 
   io.println("=== unwrap ===")
-  io.debug(result.unwrap(Ok("1234"), "default"))
-  io.debug(result.unwrap(Error(Nil), "default"))
+  echo result.unwrap(Ok("1234"), "default")
+  echo result.unwrap(Error(Nil), "default")
 
   io.println("=== pipeline ===")
   int.parse("-1234")
   |> result.map(int.absolute_value)
   |> result.try(int.remainder(_, 42))
-  |> io.debug
+  |> echo
 }
diff --git a/src/content/chapter4_standard_library/lesson03_dict_module/code.gleam b/src/content/chapter4_standard_library/lesson03_dict_module/code.gleam
index e7b3a59..ef4f775 100644
--- a/src/content/chapter4_standard_library/lesson03_dict_module/code.gleam
+++ b/src/content/chapter4_standard_library/lesson03_dict_module/code.gleam
@@ -1,14 +1,13 @@
 import gleam/dict
-import gleam/io
 
 pub fn main() {
   let scores = dict.from_list([#("Lucy", 13), #("Drew", 15)])
-  io.debug(scores)
+  echo scores
 
   let scores =
     scores
     |> dict.insert("Bushra", 16)
     |> dict.insert("Darius", 14)
     |> dict.delete("Drew")
-  io.debug(scores)
+  echo scores
 }
diff --git a/src/content/chapter4_standard_library/lesson04_option_module/code.gleam b/src/content/chapter4_standard_library/lesson04_option_module/code.gleam
index eb60001..1a19c62 100644
--- a/src/content/chapter4_standard_library/lesson04_option_module/code.gleam
+++ b/src/content/chapter4_standard_library/lesson04_option_module/code.gleam
@@ -1,4 +1,3 @@
-import gleam/io
 import gleam/option.{type Option, None, Some}
 
 pub type Person {
@@ -9,6 +8,6 @@ pub fn main() {
   let person_with_pet = Person("Al", Some("Nubi"))
   let person_without_pet = Person("Maria", None)
 
-  io.debug(person_with_pet)
-  io.debug(person_without_pet)
+  echo person_with_pet
+  echo person_without_pet
 }
diff --git a/src/content/chapter5_advanced_features/lesson00_opaque_types/code.gleam b/src/content/chapter5_advanced_features/lesson00_opaque_types/code.gleam
index d116b42..df8cda4 100644
--- a/src/content/chapter5_advanced_features/lesson00_opaque_types/code.gleam
+++ b/src/content/chapter5_advanced_features/lesson00_opaque_types/code.gleam
@@ -1,13 +1,11 @@
-import gleam/io
-
 pub fn main() {
   let positive = new(1)
   let zero = new(0)
   let negative = new(-1)
 
-  io.debug(to_int(positive))
-  io.debug(to_int(zero))
-  io.debug(to_int(negative))
+  echo to_int(positive)
+  echo to_int(zero)
+  echo to_int(negative)
 }
 
 pub opaque type PositiveInt {
diff --git a/src/content/chapter5_advanced_features/lesson01_use/code.gleam b/src/content/chapter5_advanced_features/lesson01_use/code.gleam
index 110c154..2bb86bd 100644
--- a/src/content/chapter5_advanced_features/lesson01_use/code.gleam
+++ b/src/content/chapter5_advanced_features/lesson01_use/code.gleam
@@ -1,9 +1,8 @@
-import gleam/io
 import gleam/result
 
 pub fn main() {
-  let _ = io.debug(without_use())
-  let _ = io.debug(with_use())
+  let _ = echo without_use()
+  let _ = echo with_use()
 }
 
 pub fn without_use() {
diff --git a/src/content/chapter5_advanced_features/lesson05_let_assert/code.gleam b/src/content/chapter5_advanced_features/lesson05_let_assert/code.gleam
index 2ba907a..3ca86da 100644
--- a/src/content/chapter5_advanced_features/lesson05_let_assert/code.gleam
+++ b/src/content/chapter5_advanced_features/lesson05_let_assert/code.gleam
@@ -1,11 +1,9 @@
-import gleam/io
-
 pub fn main() {
   let a = unsafely_get_first_element([123])
-  io.debug(a)
+  echo a
 
   let b = unsafely_get_first_element([])
-  io.debug(b)
+  echo b
 }
 
 pub fn unsafely_get_first_element(items: List(a)) -> a {
diff --git a/src/content/chapter5_advanced_features/lesson06_externals/code.gleam b/src/content/chapter5_advanced_features/lesson06_externals/code.gleam
index 1101b82..b761ca9 100644
--- a/src/content/chapter5_advanced_features/lesson06_externals/code.gleam
+++ b/src/content/chapter5_advanced_features/lesson06_externals/code.gleam
@@ -1,5 +1,3 @@
-import gleam/io
-
 // A type with no Gleam constructors
 pub type DateTime
 
@@ -13,5 +11,5 @@ pub fn now() -> DateTime
 // }
 
 pub fn main() {
-  io.debug(now())
+  echo now()
 }
diff --git a/src/content/chapter5_advanced_features/lesson07_multi_target_externals/code.gleam b/src/content/chapter5_advanced_features/lesson07_multi_target_externals/code.gleam
index b62a735..ae36154 100644
--- a/src/content/chapter5_advanced_features/lesson07_multi_target_externals/code.gleam
+++ b/src/content/chapter5_advanced_features/lesson07_multi_target_externals/code.gleam
@@ -1,5 +1,3 @@
-import gleam/io
-
 pub type DateTime
 
 @external(erlang, "calendar", "local_time")
@@ -7,5 +5,5 @@ pub type DateTime
 pub fn now() -> DateTime
 
 pub fn main() {
-  io.debug(now())
+  echo now()
 }
diff --git a/src/content/chapter5_advanced_features/lesson08_external_gleam_fallbacks/code.gleam b/src/content/chapter5_advanced_features/lesson08_external_gleam_fallbacks/code.gleam
index a97b8fc..ee2a86d 100644
--- a/src/content/chapter5_advanced_features/lesson08_external_gleam_fallbacks/code.gleam
+++ b/src/content/chapter5_advanced_features/lesson08_external_gleam_fallbacks/code.gleam
@@ -1,5 +1,3 @@
-import gleam/io
-
 @external(erlang, "lists", "reverse")
 pub fn reverse_list(items: List(e)) -> List(e) {
   tail_recursive_reverse(items, [])
@@ -13,6 +11,6 @@ fn tail_recursive_reverse(items: List(e), reversed: List(e)) -> List(e) {
 }
 
 pub fn main() {
-  io.debug(reverse_list([1, 2, 3, 4, 5]))
-  io.debug(reverse_list(["a", "b", "c", "d", "e"]))
+  echo reverse_list([1, 2, 3, 4, 5])
+  echo reverse_list(["a", "b", "c", "d", "e"])
 }