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lodash - A JavaScript utility library delivering consistency, modularity, performance, & extras.
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ramda A practical functional library for Javascript programmers.
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lazy.js Like Underscore, but lazier.
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underscore Underscore.js is a utility-belt library for JavaScript.
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bacon.js FRP (functional reactive programming) library for Javascript.
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fn.js A JavaScript library built to encourage a functional programming style & strategy.
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fantasy-land Specification for interoperability of common algebraic structures in JavaScript.
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mori A simple bridge to ClojureScript's persistent data structures and supporting APIs for vanilla JavaScript.
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immutable.js Immutable persistent data collections for Javascript which increase efficiency and simplicity. The chai-immutable plugin provides custom Chai assertions when testing against immutable objects.