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JS 4 U 16: Iteration

December 14, 2010 8:24:55.864

Javascript 4 U

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.

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posted by James Robertson


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,


for (m in arr) {

sum += m;


// sum: "001234"

for..in loops are to iterate over an object's properties.

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