CoffeeScript always returns in anonymous function

Question

I\'m trying to write some CoffeScript function which checks all checkboxes in a table upon checking the checkbox in the th.

My function in CoffeeScript looks like th

Answer 1

If you just use return (or, equivalently, undefined) as the last line of a function, the CoffeeScript compiler will give you JS with no return at all. So the most efficient way of writing your code would be

$("table.tableview th input:checkbox").live 'click', -> 
  checkedStatus = this.checked
  $("table.tableview tbody tr td:first-child input:checkbox").each ->
    this.checked = checkedStatus
    return
  return

(You can safely do without the second return, of course. Only a return value of false has an effect in jQuery.)

There was also a proposed syntax (-/>) for defining a function with no return value; see issue 899.