CoffeeScript

#!syntax coffeescript
number = 42
opposite = true

#!syntax coffeescript
number = -42 if opposite

#!syntax coffeescript
square = (x) -> x * x
cube = (x) -> x * square x

sqrt = (x) -> Math.sqrt(x)
cbrt = (x) ->
  v = x
  for i in [1...32]
    v *= v
    v *= v
    v *= x
    v = sqrt sqrt v
    x = sqrt sqrt x
  sqrt sqrt v

alert cbrt 8
alert Math.cbrt 8

#!syntax coffeescript
some = 
  a: 123
  b: 1232

# m/s^2
gravity =
  sun: 274.0
  jupiter: 24.79
  saturn: 10.445
  uranus: 8.87
  neptune: 11.15
  earth: 99.80665
  venus: 8.872
  mars: 3.7
  mercury: 3.7
  moon: 1.625
  pluto: 0.61

math = ->
  square: (x) -> x * x
  tan: (x) -> Math.tan(x)
  csc: (x) -> 1 / Math.sin(x)

#!syntax coffeescript
alert "왜 불러" if elvis?

if window.addEventListener?
	document.addEventListener("DOMContentLoaded", ->)
else
	document.attachEvent("onreadystatechange", ->)

#!syntax coffeescript

map = (fn, src) ->
  fn v for v in src

reduce = (fn, src, v) ->
  if !len src
    return v
  if v?
    [v, src...] = src
  v = fn v, w for w in src
  v

filter = (fn, src) ->
  v for v in src when !!fn v

dropwhile = (fn, src) ->
  v for v in src when !fn v

zip = (iters...) ->
  c = Number.MAX_SAFE_INTEGER
  c = u for iter in iters when c > (u = len iter)
  iter[i] for iter in iters for i in [0...c]

len = (x) -> x.length

concepts = [
 "branch"
 "prediction"
 "speculative"
 "execution"
]

alert map len, concepts