Why does javascript turn array indexes into strings when iterating?

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It’s because you’re looping through the array using for...in which is generally used for looping over properties of objects. The javascript engine is probably casting to a string because the string type is suitable for names of object properties.

Try this more traditional approach:

stuff = [];
stuff[0] = 3;

for(var i=0; i<stuff.length; i++) {
    var x = stuff[i];
    alert(typeof x);
}

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