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Javascript boolean interpretation

I have two simple questions for you about boolean values in Javascript.
When will browser show alert message:

        if (a-b) alert("it's true!");

And another one

What will be printed as result of running this script:

	for (var n=10; n; n-- )
		document.write (n + ",");

The answer for both questions relies on the same principle of what JavaScript engine will evaluate as true and what as false.

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  1. Mahesh
    August 13th, 2009 at 08:56 | #1


    If (a-b) is non zero, then “It’s true” alert message is displayed.
    If value a and b is same, (a-b) evaluates to 0, then no alert message.

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  2. December 28th, 2009 at 14:12 | #2

    Сheck the variable is always the equivalent of comparing a variable to null

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  3. June 1st, 2010 at 00:06 | #3

    If only I had a buck for each time I came to kossovsky.net! Amazing post.

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