calculate table columns in javascript

gistfile1.coffee

calculate_summary = ($el) ->
  $cells = $("td", $el)
  $cells.each (i, v) ->
    val =  parseInt($(this).text())
    int = if isNaN(val) then 0 else val
    if !sums[i]?
      sums[i] = 0
    sums[i] = sums[i] + int
  return sums
$ ->
  $table = $("#daily_summary")
  $rows = $("tr", $table)
  window.sums = []
  $.each $rows, (i, v) ->
    window.calculated_sums = calculate_summary( $(this))

  $lastRow = $("tr:last-child", $table)
  calculated_sums.shift()
  $.each calculated_sums, (i,v) ->
    console.log "hi"
    $lastCell = $("td:last-child", $lastRow)
    $lastCell.after("<td>#{v}</td>")