coffescript deep compare

gistfile1.coffee

# comparison function, checking also the contents of elements if we are comparing 2 arrays.
# very useful for sorting.

cmp = (a,b) ->
  typemap =
    'null': 0
    'undefined': 0
    'number': 1
    'string': 1
    'object': 2
  if typemap[typeof a] > typemap[typeof b]
    return 1
  else if typemap[typeof a] < typemap[typeof b] 
    return -1
  if (typeof a) == 'object' and a.constructor == Array
    elemCmp = 0
    [0...Math.min(a.length,b.length)].some (i) ->
      elemCmp = cmp(a[i],b[i])
      elemCmp != 0
    return elemCmp
  if a > b 
    return 1
  else if a < b
    return -1
  return 0


one = [2,10]
two = [2,5,10]
three = [2,5,5]

all = [one, two, three]

all.sort(cmp)
console.info all

# returns [ three, two, one ]