flatten.js

//eqArrays function
const eqArrays = function(Array1, Array2) {
  if (Array.isArray(Array1) &&
  Array.isArray(Array2)) {
    for (const [i, value] of Array1.entries()) {
      const value2 = Array2[i];
      if (value !== value2) {
        return false;
      }
    }
    
  } return true;
};


//assertArraysEqual function
const assertArraysEqual = function(Array1, Array2) {
  if (eqArrays(Array1, Array2)) {
    console.log(`Assertion Passed: ${Array1} ✅✅✅ ${Array2}`);
  } else {
    console.log(`Assertion Failed: ${Array1} 🛑🛑🛑 ${Array2}`);
  }
};


// Create a function flatten which will take in an array containing elements including nested arrays of elements, and return a "flattened" version of the array.

const flatten = function(arr) {
  let newArr = [];
  for (let i = 0; i < arr.length; i++) {
    if (Array.isArray(arr[i])) {
      for (let j = 0; j < arr[i].length; j++) {
        newArr.push(arr[i][j]);
      }
    } else {
      newArr.push(arr[i]);
    }
  }
  return newArr;
};

module.exports = flatten;

console.log(flatten([1, 2, [3, 4], 5, [6]]));