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CoffeeScript

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CoffeeScript attempts to shorten and simplify the syntax of JavaScript.


# Assignment:number
   = 42opposite = true# Conditions:number = -42 if opposite# Functions:square = (x) -> x * x# Arrays:list = [1, 2, 3, 4, 5]# Objects:math =
  root:
   Math.sqrt
  square: square
  cube:
   (x) -> x * square x# Splats:race = (winner, runners...) ->
  print winner, runners# Existence:alert "I knew it!" if elvis?# Array comprehensions:cubes = (math.cube num for num in list)

compiles onto:


// Generated by CoffeeScript 2.5.1(function() {  // Assignment:
  var cubes, list, math, num, number, opposite, race, square;
  number = 42;
  opposite = true;
  if (opposite) {    // Conditions:
    number = -42;
  }  // Functions:
  square = function(x) {
    return x * x;
  };  // Arrays:
  list = [1, 2, 3, 4, 5];  // Objects:
  math = {
    root: Math.sqrt,
    square: square,
    cube: function(x) {
      return x * square(x);
    }
  };  // Splats:
  race = function(winner, ...runners) {
    return print(winner, runners);
  };
  if (typeof elvis !== "undefined" && elvis !== null) {    // Existence:
    alert("I knew it!");
  }  // Array comprehensions:
  cubes = (function() {
    var i, len, results;
    results = [];
    for (i = 0, len = list.length; i < len; i++) {
      num = list[i];
      results.push(math.cube(num));
    }
    return results;
  })();}).call(this);

To install the CoffeeScript compiler:


> npm install --global coffeescript

To watch for changes in .coffee files in src/ and automatically compile them onto lib/:


>coffee --watch --compile --output lib/ src/