Run results for: Test123423432

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36

Browser: Chrome 76

Operating system: Mac OS X 10.14.3

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Raw repeat	350.0 Ops/sec
Smart repeat	186620.7 Ops/sec

Tests:

Raw repeat
function repeat(target, times) { var strLen = target.length * times; var buf = new ArrayBuffer(strLen * 2); var bufView = new Uint16Array(buf); var charCodes = target.split('').map(char => char.charCodeAt(0)); var charCodesLen = charCodes.length; for (var i = 0; i < strLen; i++) { bufView[i] = charCodes[i % charCodesLen]; } return String.fromCharCode.apply(null, bufView); } repeat('asdf', 30000);
Smart repeat
function decimalNumberToReversedBinaryString(dec) { return Number(dec).toString(2).split('').reverse().join(''); } function smartRepeat(target, times) { let ret = ""; let seed = target; // Take a number and turn it into binary. Reverse it so we can iterate small to large // 13 => 1101 in binary => 1011 reversed so the 1s place is at the front let binaryTimes = decimalNumberToReversedBinaryString(times); for (let i = 0; i < binaryTimes.length; i++) { if (parseInt(binaryTimes[i])) { // if bit is set, add the current seed to the total ret += seed; } seed += seed; // double the seed for the next iteration } return ret; } smartRepeat('asdf', 30000);