Run results for: String concatenate vs array join

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36 OPR/74.0.3911.203

Browser: Opera 74

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
string concatenate	4437.9 Ops/sec
array join	4367.6 Ops/sec

Tests:

string concatenate
let obj = {} for(let i = 0; i < 1000; i++) { obj["a"+i] = 0 } let columns = "" for(let y in obj) { columns += (y + ", ") } columns = "(" + columns.slice(0, -2) + ")"
array join
let obj = {} for(let i = 0; i < 1000; i++) { obj["a"+i] = 0 } let columns = Object.keys(obj).join(", ")