I've been told not to use for...in with arrays in JavaScript. Why not?...

How can I loop through all the entries in an array using JavaScript?  I thought it was something like this:  forEach(instance in theArray)   Where theArray is my array, but this seems to be incorrect....

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I've heard this quite a few times. Are JavaScript loops really faster when counting backward? If so, why? I've seen a few test suite examples showing that reversed loops are quicker, but I can't find any explanation as to why!  I'm...

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Closures in a loop are causing me problems. I think I have to make another function that returns a function to solve the problem, but I can't get it to work with my jQuery code.  Here is the basic problem in a simplified form:  function foo(val...

Given a simple zero based, numerically indexed array:  var list = ['Foo', 'Bar', 'Baz'];   Many times, I have noticed that when someone suggests looping through variables in an array like this:  for(var item in list) { ... }...

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How can I break the iteration on reduce method?  for  for (var i = Things.length - 1; i >= 0; i--) {   if(Things[i] <= 0){     break;   } };   reduce  Things.reduce(function(memo, current){   if(current <= 0){     //break ???     //return;...