Web Reference: Sep 3, 2012 · Regardless of how it's implemented, a push or and unshift will take O (1) time when the internal C-level array has enough spare memory, otherwise, when reallocation must be done, at least O (N) time to copy the old data to the new block of memory. Jul 23, 2025 · JavaScript Unshift () method is very much similar to the push () method but the difference is that the unshift () method adds the elements at the very beginning of the array whereas the push () method adds at the end of the array. The provided JSON represents a JavaScript microbenchmark that compares the performance of two approaches: arr.push() and arr.unshift(). The test creates an empty array, var arr = [], and then pushes or unshifts a value (42) into it. The benchmark measures the time taken to execute these operations. Options compared: Two options are being compared:
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