Fastest way to double the length

Fastest way to double the length of an array in JavaScript? - Stack Overflow
[1,2,3,4,5].duplicate();[1,2,3,4,5,1,2,3,4,5]Maybe something like:var array = [1,2,3,4,5];array.pu
Fastest way to double the length of an array in JavaScriptStack Overflow
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