Underscore.js

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1.8.3 MIT License
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An utility-belt library for JavaScript, providing functional programming aid

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Portions of Underscore are inspired by or borrowed from Oliver Steele's Functional, Prototype.js and John Resig's Micro-Templating.

Functional programming support is added, but without extending any of the built-in JavaScript objects.

Underscore provides 60-odd functions that support both the usual functional suspects: map, select, invoke — as well as more specialized helpers: function binding, JavaScript templating, deep equality testing, and so on. It delegates to built-in functions, if present, so modern browsers will use the native implementations of forEach, map, reduce, filter, every, some and indexOf.

Ports of Underscore.js are available for:
PHP
Python
Perl
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Last updated on April 3rd, 2015

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