JS 4 U 16: Iteration
Today's Javascript 4 You. Today we look at one of the more useful looping consyructs in Javascript - it's a lot like the iterators in Smalltalk. If you have trouble viewing it here in the browser, you can also navigate directly to YouTube. Join the Facebook Group to discuss the tutorials. You can view the archives here. |
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Comments
Re: JS 4 U 16: Iteration
[Peter Galiba] December 15, 2010 10:12:03.378
Do NOT EVER use for..in loop to iterate over an array. Example:
var arr = [0, 1, 2, 3, 4],
sum = 0,
m;
for (m in arr) {
sum += m;
}
// sum: "001234"
for..in loops are to iterate over an object's properties.