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Why is "arguments" a pseudo-array (array-like object) in JavaScript, but not just array? I think it happend historically, but what is the reason? Also why DOM-collections are pseudo-arrays. Does anybody know or at least have some guesses?

Sergei Martianov
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  • More info here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments – Ed Lucas Feb 20 '20 at 19:56

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If you need arguments as an array (for map(), etc.), it's easy enough to convert using the spread syntax:

let args = [...arguments];
Ed Lucas
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  • I know. Also I can use `Array.from()` and `rest operator`, but my question about the reason. Why `arguments` is pseudo-array. It's more historical question, but I really interested in that. – Sergei Martianov Feb 20 '20 at 20:02
  • @SergeiMartianov Found an answer for you: https://stackoverflow.com/questions/3242485/why-isnt-a-functions-arguments-object-an-array-in-javascript – Ed Lucas Feb 24 '20 at 01:17