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js4u

JS 4U 25: Booleans

January 20, 2011 6:41:19.708

Javascript 4 U

Today's Javascript 4 You. Today we take a look at the Boolean class in Javascript. If you have trouble viewing it here in the browser, you can also navigate directly to YouTube.

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Booleans

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Comments

Re: JS 4U 25: Booleans

[Peter Galiba] January 21, 2011 6:04:27.081

Do not use new Boolean, or the Boolean object altogether. Use the boolean primitives instead. To generate boolean primitives from the values in the video, just either use Boolean without 'new', or the '!' operator 2 times. Example:

Boolean(0);

Boolean(1);

Boolean("true");

or

!!0;

!!1

!!"true"

Why do i say that? Because the Boolean object may behave strangely:

document.write(new Boolean(new Boolean(false))); // output is "true"

var x = new Boolean(false);

if (x) {

alert(true); // This will be alerted, although the x should be false, but it is an object, and every object is truthy.

}

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