How to transform true and false to 1 and 0?

Question

I use the following code:

  var newValue = ($(event.target).is(":checked")) ? 1 : 0;
  var oldValue = (!$(event.target).is(":checked")) ? 1 : 0;
  sendMessage(this.name, oldValue, newValue);

Is there any better approach?

Answer 1

sendMessage(this.name, +!event.target.checked, +event.target.checked)

Not your sending sendMessage(text, !bool, bool) which is silly just send one bool.

Also $(thing).is(":checked") is stupid (jQuery ಠ_ಠ)

Answer 2

As Cygal noted in one of the comments, using the unary operator (+) coerces true and false into numbers. So doing +true will yield 1 while using +false will yield 0.

Answer 3

For the record: Number will also convert to 1 or 0:

sendMessage(this.name, Number(!event.target.checked), Number(event.target.checked));

Answer 4

Ah I forgot that rep doesn't transfer over, apparently I don't have enough to comment. I was going to reply to Cygal's comment on Raynos's answer:

While it is true that +true == 1, and +false == 0 that isn't exactly helpful since true == 1 and false == 0 as well. You probably meant to say that +true === 1 and +false === 0