Converting a string into a boolean

Question

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How can I convert a string to boolean in JavaScript?

I have a hidden field that contains a boolean value, I am checking if it's true or false in a JavaScript function, like this:

if (Trim(document.forms['mainform'].hiddenfield.value) == 'true')
{
}

which I think is a lame way to do this. How to convert that string value into a boolean?

This is a dupe anyways: http://stackoverflow.com/questions/263965/how-can-i-convert-a-string-to-boolean-in-javascript — Josh Stodola, Feb 05 '10 at 20:49

score 0 · Answer 1 · answered Feb 05 '10 at 20:53

This may seem a bit silly, but you could add a method to String.

String.prototype.isTrue = function() {
   return this.toLowercase() == "true"
}

gives you

>>> "true".isTrue()
true
>>> var x = "false"
>>> x.isTrue()
false

just use .isTrue() on any string literal or variable.

1 Answers1