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MIRROR: javascript for 🐜's, a tiny runtime with big ambitions ant.themackabu.dev
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JavaScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960/* * Array creation micro-bench */
function get_clock() { if (typeof performance !== 'undefined' && performance.now) return performance.now(); return Date.now();}
function run_case(name, fn, iters) { var i; var t0 = get_clock(); for (i = 0; i < iters; i++) fn(); var dt = get_clock() - t0; console.log(name + ': ' + dt.toFixed(2) + ' ms');}
function create_assign() { var tab = []; for (var i = 0; i < 1000; i++) tab[i] = i;}
function create_push() { var tab = []; for (var i = 0; i < 1000; i++) tab.push(i);}
function create_prealloc_assign() { var tab = []; tab.length = 1000; for (var i = 0; i < 1000; i++) tab[i] = i;}
function create_prealloc_push() { var tab = []; tab.length = 1000; for (var i = 0; i < 1000; i++) tab.push(i);}
function main() { var iters = 200; run_case('create_assign', create_assign, iters); run_case('create_push', create_push, iters); run_case('create_prealloc_assign', create_prealloc_assign, iters); run_case('create_prealloc_push', create_prealloc_push, iters);
var arr = []; var t0 = get_clock(); for (var i = 0; i < 20000; i++) { arr.push(i); } var dt = get_clock() - t0; console.log('push_20k: ' + dt.toFixed(2) + ' ms'); console.log('done, arr length: ' + arr.length); console.log('first element: ' + arr[0]); console.log('last element: ' + arr[19999]);}
main();