Run results for: JSON.stringify vs string concat simple

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.106 Safari/537.36

Browser: Chrome 91

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
JSON.stringify	10671.8 Ops/sec
string concat	6839.9 Ops/sec

Script Preparation code:

var testData = {};

for (let i = 0; i < 1000; i++) {
 testData[i.toString()] = "bla" + i; 
}

Tests:

JSON.stringify
const data = JSON.stringify(testData);
string concat
let str = "{"; Object.keys(testData).forEach((k) => { str += "\"".concat(k).concat("\":\"").concat(testData[k]).concat("\","); }); str = str.substring(0, str.length - 1); str += "}";