daedalus28 / underscoreko

A tiny library that adds all of the Underscore.js collection/array methods to Knockout observable arrays

UnderscoreKO

Underscore.js + Knockout = Array Happy Fun Time!

This tiny library (< 1KB) adds all the collection and array methods you've come to love in Underscore.js to your Knockout observable arrays. It will not override any existing functionality (if any exists).

Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php)

Install

Manual

Download .\build\underscore-ko-{version}.min.js and put it in your project.

Nuget

Install the UnderscoreKO Nuget package.

PM> Install-Package UnderscoreKO

Usage

Use the Underscore methods just as you normally would, but now you don't need to specify the array to use:

var vm = {
    arr: ko.observableArray([1, 2, 3]);
};

vm.arr.each(function (x) {
    // do something
});

// This returns a raw array, not a ko.observableArray
var newArr = vm.arr.union([0, 1]);

In addition, there are several functions you can use that will mutate (change) the underlying array, which are provided as convenient shortcuts.

// Re-structure the observable array [1, 2, 3]
vm.arr.without_(2);
// vm.arr() is now equal to [1, 3]

// Without this, you would need to do:
vm.arr(vm.arr.without(2));

Live Demo

View the live jsFiddle demo

Documentation

See the Underscore.js documentation for more information on the API. All array and collection methods are supported with the exception of any I felt didn't provide value (.toArray() for example).

See spec.js for examples of how to use specific functions, but I'm telling you, it's as you'd expect.

Mutator Methods

• filter_, select_
• reject_
• invoke_
• sortBy_
• groupBy_
• shuffle_
• rest_, tail_
• compact_
• flatten_
• without_
• union_
• intersection_
• difference_
• uniq_, unique_
• zip_

Contributing

See Contributing