objPerformanceTest.js

// for... in loop
let start = performance.now();
let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}
for (let key in obj) {
  let value = obj[key];
  console.log(key, value);
}
let duration = performance.now() - start;
console.log(duration); // 0.8450000023003668 ms


// Object.keys
let start = performance.now();
let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}
let items = Object.keys(obj);
console.log(items);
items.map(key => {
 let value = obj[key];
 console.log(key, value)
});
let duration = performance.now() - start;
console.log(duration); // 1.3249999901745468 ms


// Object.values
let start = performance.now();
let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}
let items = Object.values(obj);
console.log(items);
items.map(value => {
 console.log(value)
});
let duration = performance.now() - start;
console.log(duration); // 2.0549999899230897 ms


// Object.getOwnPropertyNames
let start = performance.now();
let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}
let items = Object.getOwnPropertyNames(obj);
console.log(items);
items.map(key => {
 let value = obj[key];
 console.log(key, value)
});
let duration = performance.now() - start;
console.log(duration); // 2.125000028172508 ms


// Object.entries
let start = performance.now();
let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}
let items = Object.entries(obj);
console.log(items);
items.map(item => {
 let key = item[0];
 let value = item[1];
 console.log(key, value);
});
let duration = performance.now() - start;
console.log(duration); // 1.6349999932572246 ms