Run results for: Javascript Map.set undefined vs Map.delete

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:80.0) Gecko/20100101 Firefox/80.0

Browser: Firefox 80

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Map.set undefined	0.4 Ops/sec
Map.delete	0.6 Ops/sec

Tests:

Map.set undefined

const rs = 1000000;
const testMap = new Map();
for (let i = 0; i < rs; i++) {
    testMap.set("i" + i, i);
}
for(let i = 0; i < rs; i++) {
  testMap.set("i"+i, undefined);
}

AخA
 
const rs = 1000000;const testMap = new Map();for (let i = 0; i < rs; i++) {    testMap.set("i" + i, i);}for(let i = 0; i < rs; i++) {  testMap.set("i"+i, undefined);}

Map.delete

const rs = 1000000;
const testMap = new Map();
for (let i = 0; i < rs; i++) {
    testMap.set("i" + i, i);
}
for(let i = 0; i < rs; i++) {
  testMap.delete("i"+1);
}

 
const rs = 1000000;const testMap = new Map();for (let i = 0; i < rs; i++) {    testMap.set("i" + i, i);}for(let i = 0; i < rs; i++) {  testMap.delete("i"+1);}