Run results for: .toString() concatenation vs array join with compiledFunc

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser: Chrome 116

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
String concat	34.0 Ops/sec
String join	36.5 Ops/sec
string join directly	37.1 Ops/sec
String concat directly	32.6 Ops/sec

Script Preparation code:

var array = [{a:"asd",b:5,c:null,d:new Date()},{a:"bcd",b:6,c:void 0,d:new Date()},{a:"efg",b:8,c:-1,d:new Date()}]
var compiledFuncConcat = new Function("data", "return String((data&&data.a))+String((data&&data.b))+String((data&&data.c))+String((data&&data.d));");
var compiledFuncJoin = new Function("data", "return [(data&&data.a),(data&&data.b),(data&&data.c),(data&&data.d)].join('');");

Tests:

String concat
var resultArr=[]; for(let i=0, ii = 10000; i<ii; i++){ resultArr.push(compiledFuncConcat(array[i%array.length])) }
String join
var resultArr=[]; for(let i=0, ii = 10000; i<ii; i++){ resultArr.push(compiledFuncJoin(array[i%array.length])); }
string join directly
var resultArr=[]; for(let i=0, ii = 10000; i<ii; i++){ let data = array[i%array.length]; resultArr.push([(data&&data.a),(data&&data.b),(data&&data.c),(data&&data.d)].join('')); }
String concat directly
var resultArr=[]; for(let i=0, ii = 10000; i<ii; i++){ let data = array[i%array.length]; resultArr.push(String((data&&data.a))+String((data&&data.b))+String((data&&data.c))+String((data&&data.d))); }

Run results for: .toString() concatenation vs array join with compiledFunc

String concat

String join

string join directly

String concat directly