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How to create an array containing 1...N

We'll use that fact later. Array.apply(null, [undefined, undefined, undefined]) is equivalent to Array(undefined, undefined, undefined), which produces a three-element array and assigns undefined to each element. How ...

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Loop through an array in JavaScript - Stack Overflow

In the case of an array, the callback is passed an array index and a corresponding array value each time. (The value can also be accessed through the this keyword, but Javascript will always wrap the this value as an ...

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javascript - How to replace item in array? - Stack Overflow

The question is vague. Are you asking how to replace all occurrences of a specific value (3452 in your question), or the first occurrence only, or the element of a specific index (1 in your question)? Do you want the ...