translate DTMF to digits

dtmf.coffee

originalDTMF = {
  0: 0,
  1: 1, 2: 2, 3: 3,
  4: 4, 5: 5, 6: 6,
  7: 7, 8: 8, 9: 9,

  a: 2, b: 2, c: 2,
  d: 3, e: 3, f: 3,
  g: 4, h: 4, i: 4,
  j: 5, k: 5, l: 5,
  m: 6, n: 6, o: 6,
  p: 7, q: 7, r: 7, s: 7,
  t: 8, u: 8, v: 8,
  w: 9, x: 9, y: 9, z: 9
}

dtmfMap = []
for key, num of originalDTMF
  dtmfMap[key.charCodeAt(0)] = num

sendDTMF = (keyCode) ->
  digit = dtmfMap[keyCode]
  if digit?
    console.debug(digit)

$ ->
  $('#dtmf').keypress (event) ->
    sendDTMF(event.keyCode)