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Underscore: A Functional Library for JavaScript

Alex R. Young

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libraries functional

Underscore: A Functional Library for JavaScript

Posted by Alex R. Young on .
Featured

libraries functional

Underscore: A Functional Library for JavaScript

Posted by Alex R. Young on .

Underscore is a new library for functional programming in JavaScript. Those of us who enjoy
Enumerable in Prototype will find it a
welcome addition alongside other frameworks like
jQuery.

Here are a few basic examples of the API:

_.each([1, 2, 3], function(num){ alert(num); });
_.map([1, 2, 3], function(num){ return num * 3 });

_.flatten([1, [2], [3, [[[4]]]]]);

There are also nifty functions for managing functions:

var greet    = function(name){ return "hi: " + name; };
var exclaim  = function(statement){ return statement + "!"; };
var welcome = _.compose(greet, exclaim);
welcome('moe');