diff --git a/README.md b/README.md
index 1aa8ba0..b1d9225 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ npm install bue
 ## Usage
 
 ```javascript
-var biu = require('bue');
+var bue = require('bue');
 
 bue.isArray([1,2,3]);
 // => true
@@ -33,6 +33,11 @@ All the functions used in Bue is based on lodash(v4.0.0-pre), some of them have
   ```
     bue.clone(value)
   ```
+- eq
+  Compare two values(arrays, booleans, Date objects, numbers) if they ware equivalent.
+  ```
+    bue.eq(object, other);
+  ```
 - isArray  
   Checks if `value` is classified as an `Array` object.
   ```
@@ -198,6 +203,11 @@ All the functions used in Bue is based on lodash(v4.0.0-pre), some of them have
 ### Collection Functions
   > `bue.iteratee`: a function that a invokes `func` with the arguments of the created function.
 
+- contains
+  Check if `target` is in `collection`
+  ```
+    bue.contains(collection, value, [fromIndex=0])
+  ```
 - each  
   Iterates over elements of `collection` invoking `iteratee` for each element. The iteratee is invoked with three arguments: (value, index|key, collection). Iteratee functions may exit iteration early by explicitly returning `false`.
   ```
diff --git a/lib/collection/includes.js b/lib/collection/includes.js
new file mode 100644
index 0000000..b03dc09
--- /dev/null
+++ b/lib/collection/includes.js
@@ -0,0 +1,57 @@
+var baseIndexOf = require('../internal/baseIndexOf'),
+    getLength = require('../internal/getLength'),
+    isArray = require('../lang/isArray'),
+    isIterateeCall = require('../internal/isIterateeCall'),
+    isLength = require('../internal/isLength'),
+    isString = require('../lang/isString'),
+    values = require('../object/values');
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max;
+
+/**
+ * Checks if `target` is in `collection` using
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons. If `fromIndex` is negative, it's used as the offset
+ * from the end of `collection`.
+ *
+ * @static
+ * @memberOf bue
+ * @alias contains, include
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {*} target The value to search for.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @param- {Object} [guard] Enables use as a callback for functions like `bue.reduce`.
+ * @returns {boolean} Returns `true` if a matching element is found, else `false`.
+ * @example
+ *
+ * bue.includes([1, 2, 3], 1);
+ * // => true
+ *
+ * bue.includes([1, 2, 3], 1, 2);
+ * // => false
+ *
+ * bue.includes({ 'user': 'fred', 'age': 40 }, 'fred');
+ * // => true
+ *
+ * bue.includes('pebbles', 'eb');
+ * // => true
+ */
+function includes(collection, target, fromIndex, guard) {
+  var length = collection ? getLength(collection) : 0;
+  if (!isLength(length)) {
+    collection = values(collection);
+    length = collection.length;
+  }
+  if (typeof fromIndex != 'number' || (guard && isIterateeCall(target, fromIndex, guard))) {
+    fromIndex = 0;
+  } else {
+    fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : (fromIndex || 0);
+  }
+  return (typeof collection == 'string' || !isArray(collection) && isString(collection))
+    ? (fromIndex <= length && collection.indexOf(target, fromIndex) > -1)
+    : (!!length && baseIndexOf(collection, target, fromIndex) > -1);
+}
+
+module.exports = includes;
diff --git a/lib/index.js b/lib/index.js
index 691d8a9..c86c2e3 100755
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,6 +1,7 @@
 module.exports = {
   // Language Functions
   'clone': require('./lang/clone'),
+  'eq': require('./lang/isEqual'),
   'isArray': require('./lang/isArray'),
   'isBoolean': require('./lang/isBoolean'),
   'isDate': require('./lang/isDate'),
@@ -40,6 +41,7 @@ module.exports = {
   'escapeRegExp': require('./string/escapeRegExp'),
 
   // Collection Functions
+  'contains': require('./collection/includes'),
   'each': require('./collection/forEach'),
   'eachRight': require('./collection/forEachRight'),
   'map': require('./collection/map'),
diff --git a/lib/internal/baseIndexOf.js b/lib/internal/baseIndexOf.js
new file mode 100644
index 0000000..a3182f8
--- /dev/null
+++ b/lib/internal/baseIndexOf.js
@@ -0,0 +1,27 @@
+var indexOfNaN = require('./indexOfNaN');
+
+/**
+ * The base implementation of `bue.indexOf` without support for binary searches.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function baseIndexOf(array, value, fromIndex) {
+  if (value !== value) {
+    return indexOfNaN(array, fromIndex);
+  }
+  var index = fromIndex - 1,
+      length = array.length;
+
+  while (++index < length) {
+    if (array[index] === value) {
+      return index;
+    }
+  }
+  return -1;
+}
+
+module.exports = baseIndexOf;
diff --git a/lib/internal/bindCallback.js b/lib/internal/bindCallback.js
new file mode 100644
index 0000000..cdc7f49
--- /dev/null
+++ b/lib/internal/bindCallback.js
@@ -0,0 +1,39 @@
+var identity = require('../utility/identity');
+
+/**
+ * A specialized version of `baseCallback` which only supports `this` binding
+ * and specifying the number of arguments to provide to `func`.
+ *
+ * @private
+ * @param {Function} func The function to bind.
+ * @param {*} thisArg The `this` binding of `func`.
+ * @param {number} [argCount] The number of arguments to provide to `func`.
+ * @returns {Function} Returns the callback.
+ */
+function bindCallback(func, thisArg, argCount) {
+  if (typeof func != 'function') {
+    return identity;
+  }
+  if (thisArg === undefined) {
+    return func;
+  }
+  switch (argCount) {
+    case 1: return function(value) {
+      return func.call(thisArg, value);
+    };
+    case 3: return function(value, index, collection) {
+      return func.call(thisArg, value, index, collection);
+    };
+    case 4: return function(accumulator, value, index, collection) {
+      return func.call(thisArg, accumulator, value, index, collection);
+    };
+    case 5: return function(value, other, key, object, source) {
+      return func.call(thisArg, value, other, key, object, source);
+    };
+  }
+  return function() {
+    return func.apply(thisArg, arguments);
+  };
+}
+
+module.exports = bindCallback;
diff --git a/lib/internal/indexOfNaN.js b/lib/internal/indexOfNaN.js
new file mode 100644
index 0000000..05b8207
--- /dev/null
+++ b/lib/internal/indexOfNaN.js
@@ -0,0 +1,23 @@
+/**
+ * Gets the index at which the first occurrence of `NaN` is found in `array`.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {number} fromIndex The index to search from.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {number} Returns the index of the matched `NaN`, else `-1`.
+ */
+function indexOfNaN(array, fromIndex, fromRight) {
+  var length = array.length,
+      index = fromIndex + (fromRight ? 0 : -1);
+
+  while ((fromRight ? index-- : ++index < length)) {
+    var other = array[index];
+    if (other !== other) {
+      return index;
+    }
+  }
+  return -1;
+}
+
+module.exports = indexOfNaN;
diff --git a/lib/internal/isLength.js b/lib/internal/isLength.js
new file mode 100644
index 0000000..2092987
--- /dev/null
+++ b/lib/internal/isLength.js
@@ -0,0 +1,20 @@
+/**
+ * Used as the [maximum length](http://ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer)
+ * of an array-like value.
+ */
+var MAX_SAFE_INTEGER = 9007199254740991;
+
+/**
+ * Checks if `value` is a valid array-like length.
+ *
+ * **Note:** This function is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
+ */
+function isLength(value) {
+  return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
+}
+
+module.exports = isLength;
diff --git a/lib/lang/isEqual.js b/lib/lang/isEqual.js
new file mode 100644
index 0000000..7207178
--- /dev/null
+++ b/lib/lang/isEqual.js
@@ -0,0 +1,54 @@
+var baseIsEqual = require('../internal/baseIsEqual'),
+    bindCallback = require('../internal/bindCallback');
+
+/**
+ * Performs a deep comparison between two values to determine if they are
+ * equivalent. If `customizer` is provided it's invoked to compare values.
+ * If `customizer` returns `undefined` comparisons are handled by the method
+ * instead. The `customizer` is bound to `thisArg` and invoked with up to
+ * three arguments: (value, other [, index|key]).
+ *
+ * **Note:** This method supports comparing arrays, booleans, `Date` objects,
+ * numbers, `Object` objects, regexes, and strings. Objects are compared by
+ * their own, not inherited, enumerable properties. Functions and DOM nodes
+ * are **not** supported. Provide a customizer function to extend support
+ * for comparing other values.
+ *
+ * @static
+ * @memberOf bue
+ * @alias eq
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @param {Function} [customizer] The function to customize value comparisons.
+ * @param {*} [thisArg] The `this` binding of `customizer`.
+ * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+ * @example
+ *
+ * var object = { 'user': 'fred' };
+ * var other = { 'user': 'fred' };
+ *
+ * object == other;
+ * // => false
+ *
+ * bue.isEqual(object, other);
+ * // => true
+ *
+ * // using a customizer callback
+ * var array = ['hello', 'goodbye'];
+ * var other = ['hi', 'goodbye'];
+ *
+ * bue.isEqual(array, other, function(value, other) {
+ *   if (bue.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/)) {
+ *     return true;
+ *   }
+ * });
+ * // => true
+ */
+function isEqual(value, other, customizer, thisArg) {
+  customizer = typeof customizer == 'function' ? bindCallback(customizer, thisArg, 3) : undefined;
+  var result = customizer ? customizer(value, other) : undefined;
+  return  result === undefined ? baseIsEqual(value, other, customizer) : !!result;
+}
+
+module.exports = isEqual;
diff --git a/test/collection.js b/test/collection.js
index dd32a2c..4d1f3fe 100644
--- a/test/collection.js
+++ b/test/collection.js
@@ -9,7 +9,16 @@ describe ('Collection', function() {
 
   beforeEach(function() {
     iterator = 0;
-  })
+  });
+
+  describe('#contains(collection, value)', function() {
+    it('Returns true if the equivalent values found', function() {
+      expect(bue.contains([1, 2, 3], 1)).to.equal(true);
+      expect(bue.contains([1, 2, 3], 1, 2)).to.equal(false);
+      expect(bue.contains({ 'user': 'fred', 'age': 40 }, 'fred')).to.equal(true);
+      expect(bue.contains('pebbles', 'eb')).to.equal(true);
+    });
+  });
 
   describe('#each(collection)', function() {
     it('should return each element key & value', function() {
diff --git a/test/language.js b/test/language.js
index 94cdda1..23f5166 100644
--- a/test/language.js
+++ b/test/language.js
@@ -17,6 +17,16 @@ describe ('Language', function() {
     });
   });
 
+  describe('#eq(object, target)', function() {
+    var object = { 'user': 'fred' };
+    var other = { 'user': 'fred' };
+
+    it('Returns true if the values are equivalent', function() {
+      expect(bue.eq(object, other)).to.equal(true);
+      expect(object === other).to.equal(false);
+    });
+  });
+
   describe('#isArray(value)', function() {
     it('should return if `value` is classified as an `Array` object', function() {
       expect(bue.isArray('abc')).to.equal(false);