Run results for: String Concat vs JSON.stringify

Run details:

User agent: Mozilla/5.0 (Linux; Android 6.0.1; SM-J500F Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.83 Mobile Safari/537.36

Browser: Chrome Mobile 58

Operating system: Android 6.0.1

Device Platform: Samsung SM-J500F

Date tested: 6 years ago

Test name	Executions per second
JSON.stringify	13.4 Ops/sec
String concat	15.5 Ops/sec

Script Preparation code:

var availableSizes = [];
for(var i=0;i<10000;i++){
  availableSizes.push({label: i, system: i});
}

Tests:

JSON.stringify
var output=[]; for(var i=0, len=availableSizes.length; i<len; i++){ output.push(JSON.stringify(availableSizes[i])); }
String concat
var output=[], SUPER_DELIM = '|', string; for(var i=0, len=availableSizes.length; i<len; i++){ string = Object.keys(availableSizes[i]).reduce(function(str, key) { return str + key + SUPER_DELIM; }, '|'); output.push(string); }