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This code, from 2007, is deprecated. I'm keeping it available for historical interest.

Some of the ideas in this code and in its companioncollections.js were used in Jeremy Ashkenas'sUnderscore.js, which in turn inspiredLodash. Use those instead.

CoffeeScript (aso by Jeremy Ashkenas) and ECMAScript 6 also includearrow functions and functional programming functions such asmap. If you use these languages, or many other modern languages that compile into ECMAScript, you can do functional prorammming entirely within the language.

Thanks to everyone who has contributed, and to everyone who has thanked me over the years, thank you in turn.

• Demo page
• Announcement
• Original README file (also below)
• Original repo (Google Code)

Functional defines higher-order methods and functions for functionaland function-level programming. It also defines "string lambdas",that allow strings such asx+1 andx -> x+1 to be used in somecontexts as functions.

It is licensed under the MIT License.

For more details, seehttp://osteele.com/sources/javascript/functional/.

• Oliver Steele – original author
• Dean Edwards –Array.slice suggestion
• henrah –Function.lambda memoization
• Raganwald – Rhino compatibility
• Jesse Hallett – Spidermonkey shell compatibiilty
• Florian Schäfer – allow leading and trailing spaces in expressions
• Angus Croll – bug fix