Run results for: Map iteration + clearing

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

for...of + delete

133.5M/s

forEach + delete

105.7M/s

for...of + clear

44.5M/s

forEach + clear

36.3M/s

View exact numbers

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

var myMap = new Map();
for (let i = 0; i < 200; i++) {
  const key = {};
  const value = {value: Math.random()};
  myMap.set(key, value);
}

Tests:

forEach + clear
myMap.forEach((value, key) => { console.log(value, key); }); myMap.clear();
forEach + delete
myMap.forEach((value, key) => { console.log(value, key); myMap.delete(key); });
for...of + clear
for (const entry of myMap) { console.log(entry[1], entry[0]); } myMap.clear();
for...of + delete
for (const entry of myMap) { console.log(entry[1], entry[0]); myMap.delete(entry[0]); }