i m confused working with javascript arrays

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Is JavaScript a pass-by-reference or pass-by-value language? 29 answers

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y[..] = ... is modifying an existing object. That change is visible to anything that holds a reference to that object.

y = ... assigns an entirely new value to the local y variable and discards the previously assigned object reference. That change is not visible outside the function since nothing else has access to the y variable.

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