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Learning Functional Programming with JavaScript

Learning Functional Programming with JavaScript

Given at JSUnconf 2016 (http://2016.jsunconf.eu/)

Anjana Sofia Vakil

April 24, 2016
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  1. Not functional: var name = “Anjana”; var greeting = “Hi,

    I’m ”; console.log(greeting + name); => “Hi, I’m Anjana”
  2. Functional: function greet(name) { return “Hi, I’m ” + name;

    } greet(“Anjana”); => “Hi, I’m Anjana”
  3. function makeAdjectifier(adjective) { return function (string) { return adjective +

    “ ” + string; }; } var coolifier = makeAdjectifier(“cool”); coolifier(“conference”); => “cool conference”
  4. No mutation (good!): var rooms = [“H1”, “H2”, “H3”]; Var

    newRooms = rooms.map(function (rm) { if (rm == “H3”) { return “H4”; } else { return rm; } }); newRooms; => ["H1", "H2", "H4"] rooms; => ["H1", "H2", "H3"]
  5. FP libraries for JS • Mori (http://swannodette.github.io/mori/) • Immutable.js (https://facebook.github.

    io/immutable-js/) • Underscore (http://underscorejs.org/) • Lodash (https://lodash.com/) • Ramda (http://ramdajs.com/) • ...and more!