arrays - javascript operator "in" -

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i'm used python, so

a = [1,2,3] 1 in # -> true b = ["1", "2", "3", "x"] "x" in b # -> true

why in javascript

a = [1,2,3] 1 in // -> true b = ["1", "2", "3", "x"] "x" in b // -> false

and weirder

"1" in b // -> true

in works on keys of arrays, not values. 1 in a succeeds because there element #1 in array, 2 value.

"1" fails, because there no 1 property or key in array.

details here: https://developer.mozilla.org/en/javascript/reference/operators/in


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