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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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With the release of ES5 the forEach was also released so you can use forEach to loop over the array as follows:-

var abc = ["a", "b", "c"]; 

abc.forEach(function(entry) {