Question

87

rated 0 times [ 94] [ 7] / answers: 1 / hits: 55968 / 9 Years ago, fri, october 23, 2015, 12:00:00

Whats the easiest way (with native javascript) to duplicate every element in a javascript array?

The order matters.

For example:

a = [2, 3, 1, 4]

// do something with a

a

// a is now [2, 2, 3, 3, 1, 1, 4, 4]

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answered 9 Years ago kristineterrak · Accepted Answer

I came up with something similar to tymeJV's answer

[2, 3, 1, 4].reduce(function (res, current, index, array) {

    return res.concat([current, current]);

}, []);