coffeescript useful snippets 1

# Eat lunch.
eat = (food) -> "#{food} eaten."
eat food for food in ['toast', 'cheese', 'wine']

# Fine five course dining.
courses = ['greens', 'caviar', 'truffles', 'roast', 'cake']
menu = (i, dish) -> "Menu Item #{i}: #{dish}"
menu i + 1, dish for dish, i in courses

# Health conscious meal.
foods = ['broccoli', 'spinach', 'chocolate']
console.log (eat food for food in foods when food isnt 'chocolate'
#------
[1..10].filter (x) ->  x%2
#------
console.log i for i in [10..0]
#------
for i in [10..0]
    console.log i
#------
for i in [10..0] then console.log i
#------
data = [ 1, 2, 3, "a", "b", "c", 2, 3, 4, "b", "c", "d" ]
set = []
set.push i for i in data when not (i in set)
console.log data
console.log set
#------
keys = ['a','b','c']
  values = [1,2,3]
  map = {}
  map[key] = values[i] for key, i in keys
#---------
sameOcc = []
nums1 = [3,1,2,2,1]
nums2 = [2,2,3]
sameOcc.push i for i in nums1 when i in nums1 and i in nums2

console.log sameOcc
#[3,2,2]
#---------
sumOfSquares = ( list ) ->
    list.reduce (( sum, x ) -> sum + x ), 0
sumOfSquares [1,2,3,4]
#10
#---------
class Foo
    @staticMethod: -> 'Bar'

    instanceMethod: -> 'Baz'

foo = new Foo

foo.instanceMethod() #=> 'Baz'
Foo.staticMethod() #=> 'Bar'
#---------
launch() if ignition is on
#---------
volume = 10 if band isnt SpinalTap
#---------
letTheWildRumpusBegin() unless answer is no
#---------
if car.speed < limit then accelerate()
#---------
winner = yes if pick in [47, 92, 13]
#---------
print inspect "My name is #{@name}"
#---------
eldest = if 24 > 21 then "Liz" else "Ike"
#---------
for a from b _EQUIVALENT_ for (a of b)
#---------
a ? b   returns a if a is in scope and a != null; otherwise, b
#---------
sleep = (ms) ->
  new Promise (resolve) ->
    window.setTimeout resolve, ms

say = (text) ->
  window.speechSynthesis.cancel()
  window.speechSynthesis.speak new SpeechSynthesisUtterance text

countdown = (seconds) ->
  for i in [seconds..1]
    say i
    await sleep 1000 # wait one second
  say "Blastoff!"

countdown 3
#---------
ages = for child, age of yearsOld
  "#{child} is #{age}"

# => [ 'max is 10', 'ida is 9', 'tim is 11' ]
#---------
#---------
#---------
#---------
#---------
#---------
#---------