Re: Using for ... in with arrays

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#191

From: Bob Stucky
Date: Tue, 31 Mar 2009 16:24

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There is a difference between the two. In the second example below, i is a string, not an int. (put a debugger statement in there and do typeof( i ); in the console to prove it). In the second example we're asking for the array index of:
"01", "11", "12"...

And they're all undefined.

I NEVER use the for( var i in array ) syntax for that reason. If you do introduce a bug there, it's one of those bugs that your eye doesn't catch, and takes forever to find.

Bob

var array = [0,1,2,3,4,5,6,7,8,9];

for ( var i = 0; i < array.length - 1; i++ ) {
	$.writeln( array[ i + 1 ] );
}

for ( var i in array ) {
	$.writeln( array[ i + 1 ] );
}

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Subject: Re: Using for ... in with arrays
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Date: Tue, 31 Mar 2009 09:24:14 -0700
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