basic coffeescript find if in array

Question

In coffee script I'm trying to figure out if something is included in an array or not. But can't seem to figure out the correct syntax. Is there not a way to do this without have to iterate over them?

Thanks,

  if $(this).val() is in ["needs_cover","comatose"]
    $("#head_count").hide()
  else
    $("#head_count").show()

$(this).val() in ["needs_cover", "comatose"] should work.

David
– David

2013-09-12 08:10:28 +00:00
Commented Sep 12, 2013 at 8:10 — David
– David, Commented Sep 12, 2013 at 8:10
I knew I was close thanks!

ere
– ere

2013-09-12 08:13:53 +00:00
Commented Sep 12, 2013 at 8:13 — ere
– ere, Commented Sep 12, 2013 at 8:13

Ja͢ck · Accepted Answer · 2013-09-12 08:17:51Z

6

Just drop the is:

if $(this).val() in ["needs_cover","comatose"]
    $("#head_count").hide()
  else
    $("#head_count").show()

That would translate to the following JavaScript:

var _ref;

if ((_ref = $(this).val()) === "needs_cover" || _ref === "comatose") {
  $("#head_count").hide();
} else {
  $("#head_count").show();
}

answered Sep 12, 2013 at 8:17

Ja͢ck

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Comments

TheRocketSurgeon · Accepted Answer · 2013-09-12 18:35:26Z

0

If this is a common use case, you could write a function, which would also allow you to write a routine that is a bit more compact as well, like so:

hideShowFn = (valSelector, hideShowElSelector, compareArr) ->
    if $(valSelector).val() in compareArr then return $(hideShowElSelector).hide()
    $(hideShowElSelector).show()

I prefer doing the above as it flattens the code a little bit. This is my preference.

You would call the function like so:

hideShowFn this, '#head_count', ['needs_cover', 'comatose']

answered Sep 12, 2013 at 18:35

TheRocketSurgeon

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