mirror of
https://github.com/adambard/learnxinyminutes-docs.git
synced 2024-11-24 15:03:19 +03:00
103 lines
2.8 KiB
Markdown
103 lines
2.8 KiB
Markdown
---
|
|
language: coffeescript
|
|
contributors:
|
|
- ["Tenor Biel", "http://github.com/L8D"]
|
|
- ["Xavier Yao", "http://github.com/xavieryao"]
|
|
filename: coffeescript.coffee
|
|
---
|
|
|
|
CoffeeScript is a little language that compiles one-to-one into the equivalent JavaScript, and there is no interpretation at runtime.
|
|
As one of the successors to JavaScript, CoffeeScript tries its best to output readable, pretty-printed and smooth-running JavaScript code, which works well in every JavaScript runtime.
|
|
|
|
See also [the CoffeeScript website](http://coffeescript.org/), which has a complete tutorial on CoffeeScript.
|
|
|
|
```coffeescript
|
|
# CoffeeScript is a hipster language.
|
|
# It goes with the trends of many modern languages.
|
|
# So comments are like Ruby and Python, they use number symbols.
|
|
|
|
###
|
|
Block comments are like these, and they translate directly to '/ *'s and '* /'s
|
|
for the resulting JavaScript code.
|
|
|
|
You should understand most of JavaScript semantics
|
|
before continuing.
|
|
###
|
|
|
|
# Assignment:
|
|
number = 42 #=> var number = 42;
|
|
opposite = true #=> var opposite = true;
|
|
|
|
# Conditions:
|
|
number = -42 if opposite #=> if(opposite) { number = -42; }
|
|
|
|
# Functions:
|
|
square = (x) -> x * x #=> var square = function(x) { return x * x; }
|
|
|
|
fill = (container, liquid = "coffee") ->
|
|
"Filling the #{container} with #{liquid}..."
|
|
#=>var fill;
|
|
#
|
|
#fill = function(container, liquid) {
|
|
# if (liquid == null) {
|
|
# liquid = "coffee";
|
|
# }
|
|
# return "Filling the " + container + " with " + liquid + "...";
|
|
#};
|
|
|
|
# Ranges:
|
|
list = [1..5] #=> var list = [1, 2, 3, 4, 5];
|
|
|
|
# Objects:
|
|
math =
|
|
root: Math.sqrt
|
|
square: square
|
|
cube: (x) -> x * square x
|
|
#=> var math = {
|
|
# "root": Math.sqrt,
|
|
# "square": square,
|
|
# "cube": function(x) { return x * square(x); }
|
|
# };
|
|
|
|
# Splats:
|
|
race = (winner, runners...) ->
|
|
print winner, runners
|
|
#=>race = function() {
|
|
# var runners, winner;
|
|
# winner = arguments[0], runners = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
|
|
# return print(winner, runners);
|
|
# };
|
|
|
|
# Existence:
|
|
alert "I knew it!" if elvis?
|
|
#=> if(typeof elvis !== "undefined" && elvis !== null) { alert("I knew it!"); }
|
|
|
|
# Array comprehensions:
|
|
cubes = (math.cube num for num in list)
|
|
#=>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;
|
|
# })();
|
|
|
|
foods = ['broccoli', 'spinach', 'chocolate']
|
|
eat food for food in foods when food isnt 'chocolate'
|
|
#=>foods = ['broccoli', 'spinach', 'chocolate'];
|
|
#
|
|
#for (_k = 0, _len2 = foods.length; _k < _len2; _k++) {
|
|
# food = foods[_k];
|
|
# if (food !== 'chocolate') {
|
|
# eat(food);
|
|
# }
|
|
#}
|
|
```
|
|
|
|
## Additional resources
|
|
|
|
- [Smooth CoffeeScript](http://autotelicum.github.io/Smooth-CoffeeScript/)
|
|
- [CoffeeScript Ristretto](https://leanpub.com/coffeescript-ristretto/read)
|