Run results for: String concatenate vs array join

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; SM-G973F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.86 Mobile Safari/537.36

Browser: Chrome Mobile 89

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
string concatenate	3976.5 Ops/sec
array join	4512.3 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(", ")