++i vs i++ · jsPerf

JavaScript performance comparison Test case created by uupaa on 2012-2-24 Preparation code <script> Benchmark.prototype.setup = function() { function createArray(num) { var rv = [], i = 0; for (i = 0; i < num; ++i) { rv[i] = i; } return rv; } function createReservedArray(num) { var rv = Array(num), i = 0; for (i = 0; i < num; ++i) { rv[i] = i; } return rv; } window.dataLength = 500 * 1000; window.