A collection of Object functions.

• MDN Object

Used to iterate through an object.

Object.each(obj, fn[, bind]);

1. obj - (object) The object to iterate through.
2. fn - (function) The function to test for each element.
3. bind - (object, optional) The object to use as 'this' within the function. For more information see Function:bind.

fn(item, key, object)

1. item - (mixed) The current item in the array.
2. key - (mixed) The current item's key.
3. object - (mixed) The actual array/object.

// alerts 'The first day of the week is Sunday', 'The second day of the week is Monday', etc.:
Object.each({first: 'Sunday', second: 'Monday', third: 'Tuesday'}, function(value, key){
    alert('The ' + key + ' day of the week is ' + value);
});

This method is an object-specific equivalent of $each from MooTools 1.2.

Merges any number of objects recursively without referencing them or their sub-objects.

var merged = Object.merge(obj1, obj2[, obj3[, ...]]);

1. (objects) Any number of objects.

• (object) The object that is created as a result of merging all the objects passed in.

var obj1 = {a: 0, b: 1};
var obj2 = {c: 2, d: 3};
var obj3 = {a: 4, d: 5};
var merged = Object.merge(obj1, obj2, obj3); // returns {a: 4, b: 1, c: 2, d: 5}, (obj2, and obj3 are unaltered)

merged === obj1; // true, obj1 gets altered and returned as merged object

var nestedObj1 = {a: {b: 1, c: 1}};
var nestedObj2 = {a: {b: 2}};
var nested = Object.merge(nestedObj1, nestedObj2); // returns: {a: {b: 2, c: 1}}

Returns a copy of an object.

var clone = Object.clone(obj);

1. (obj) The object to clone

• (object) A copy of the passed object

var obj1 = {a: 0, b: 1};
var obj2 = Object.clone(obj1);

obj1.a = 42;
alert(obj1.a);    // alerts '42'
alert(obj2.a);    // alerts '0'

This is an object-specific equivalent of $unlink from MooTools 1.2.

Copies all the properties from the second object passed in to the first object passed in.

Object.append(original, extension);

1. original - (object) The object to be extended.
2. extension - (object) The object whose properties will be copied to original.

• (object) The first object passed in, extended.

var firstObj = {
    name: 'John',
    lastName: 'Doe'
};
var secondObj = {
    age: '20',
    sex: 'male',
    lastName: 'Dorian'
};
Object.append(firstObj, secondObj);
//firstObj is now: {name: 'John', lastName: 'Dorian', age: '20', sex: 'male'};

This method is an object-specific equivalent of $extend from MooTools 1.2.

Get a subset of an object.

Object.subset(object, keys);

1. object - (object) The object.
2. keys - (array) An array with the keys.

• (object) The subset of the Object.

var object = {
    a: 'one',
    b: 'two',
    c: 'three'
};
Object.subset(object, ['a', 'c']); // returns {a: 'one', c: 'three'}

Creates a new map with the results of calling a provided function on every value in the map.

var mappedObject = Object.map(object, fn[, bind]);

1. object - (object) The object.
2. fn - (function) The function to produce an element of the Object from an element of the current one.
3. bind - (object, optional) The object to use as 'this' in the function. For more information see Function:bind.

fn(value, key, object)

1. value - (mixed) The current value in the object.
2. key - (string) The current value's key in the object.
3. object - (object) The actual object.

• (object) The new mapped object.

var myObject = {a: 1, b: 2, c: 3};
var timesTwo = Object.map(myObject, function(value, key){
    return value * 2;
}); // timesTwo now holds an object containing: {a: 2, b: 4, c: 6};

Creates a new object with all of the elements of the object for which the provided filtering function returns true.

var filteredObject = Object.filter(object, fn[, bind]);

1. object - (object) The object.
2. fn - (function) The function to test each element of the Object. This function is passed the value and its key in the Object.
3. bind - (object, optional) The object to use as 'this' in the function. For more information see Function:bind.

fn(value, key, object)

1. value - (mixed) The current value in the object.
2. key - (string) The current value's key in the object.
3. object - (object) The actual object.

• (object) The new filtered object.

var myObject = {a: 10, b: 20, c: 30};
var biggerThanTwenty = Object.filter(myObject, function(value, key){
    return value > 20;
}); // biggerThanTwenty now holds an object containing: {c: 30}

Returns true if every value in the object satisfies the provided testing function.

var allPassed = Object.every(object, fn[, bind]);

1. object - (object) The object.
2. fn - (function) The function to test each element of the Object. This function is passed the value and its key in the Object.
3. bind - (object, optional) The object to use as 'this' in the function. For more information see Function:bind.

fn(value, key, object)

1. value - (mixed) The current value in the object.
2. key - (string) The current value's key in the object.
3. object - (object) The actual object.

• (boolean) If every value in the Object satisfies the provided testing function, returns true. Otherwise, returns false.

var myObject = {a: 10, b: 4, c: 25, d: 100};
var areAllBigEnough = Object.every(myObject, function(value, key){
    return value > 20;
}); // areAllBigEnough = false

Returns true if at least one value in the object satisfies the provided testing function.

var anyPassed = Object.some(object, fn[, bind]);

1. object - (object) The object.
2. fn - (function) The function to test each element of the object. This function is passed the value and its key in the object.
3. bind - (object, optional) The object to use as 'this' in the function. For more information see Function:bind.

fn(value, key, object)

1. value - (mixed) The current value in the object.
2. key - (string) The current value's key in the object.
3. object - (object) The actual object.

• (boolean) If any value in the object satisfies the provided testing function, returns true. Otherwise, returns false.

var myObject = {a: 10, b: 4, c: 25, d: 100};
var areAnyBigEnough = Object.some(myObject, function(value, key){
    return value > 20;
}); //isAnyBigEnough = true

Returns an array containing all the keys, in the same order as the values returned by Object:values.

var keys = Object.keys(object);

1. object - (object) The object.

• (array) An array containing all the keys of the object.

Returns an array containing all the values, in the same order as the keys returned by Object:keys.

var values = Object.values(object);

1. object - (object) The object.

• (array) An array containing all the values of the object.

Returns the number of keys in the object.

var length = Object.getLength(object);

1. object - (object) The object.

• (number) The length of the object.

var myObject = {
    name: 'John',
    lastName: 'Doe'
});
Object.getLength(myObject); // returns 2

Returns the key of the specified value. Synonymous with Array:indexOf.

var key = Object.keyOf(object, item);

1. object - (object) The object.
2. item - (mixed) The item to search for in the object.

• (string) If the object has a the specified item in it, returns the key of that item.
• (boolean) Otherwise, returns null.

var myObject = {a: 'one', b: 'two', c: 3};
Object.keyOf(myObject, 'two'); // returns 'b'
Object.keyOf(myObject, 3); // returns 'c'
Object.keyOf(myObject, 'four'); // returns false

Tests for the presence of a specified value in the object.

var inObject = Object.contains(object, value);

1. object - (object) The object.
2. value - (mixed) The value to search for in the Object.

• (boolean) If the object has the passed in value in any of the keys, returns true. Otherwise, returns false.

var myObject = {a: 'one', b: 'two', c: 'three'};
Object.contains(myObject, 'one'); // returns true
Object.contains(myObject, 'four'); // returns false

Generates a query string from key/value pairs in an object and URI encodes the values.

var queryString = Object.toQueryString(object[, base]);

1. object - (object) The object to generate the query string from.
2. base - (string, optional) Will be used as base variable in the query string.

• (string) The query string.

Object.toQueryString({apple: 'red', lemon: 'yellow'}); // returns 'apple=red&lemon=yellow'

Object.toQueryString({apple: 'red', lemon: 'yellow'}, 'fruits'); // returns 'fruits[apple]=red&fruits[lemon]=yellow'

Hash has been deprecated. Each Hash method has a similar Object method or a Vanilla JS equivalent.

You could simply use myObject.myKey != undefined

Use Object.keyOf

Use Object.contains

Use Object.append

Use Object.merge

Use delete myObject.a

Use myObject.myKey

Use myObject.myKey = value

Use myObject = {}

Use if(myObject.myKey == undefined) myObject.myKey = value

Use Object.map

Use Object.filter

Use Object.every

Use Object.some

Use Object.keys

Use Object.values

Use Object.toQueryString