1// object to loop through
2let obj = { first: "John", last: "Doe" };
3
4// loop through object and log each key and value pair
5//ECMAScript 5
6Object.keys(obj).forEach(function(key) {
7 console.log(key, obj[key]);
8});
9
10//ECMAScript 6
11for (const key of Object.keys(obj)) {
12 console.log(key, obj[key]);
13}
14
15//ECMAScript 8
16Object.entries(obj).forEach(
17 ([key, value]) => console.log(key, value)
18);
19
20// OUTPUT
21/*
22 first John
23 last Doe
24*/
1let obj = {
2 key1: "value1",
3 key2: "value2",
4 key3: "value3"
5}
6
7Object.keys(obj).forEach(key => {
8 console.log(key, obj[key]);
9});
10// key1 value1
11// key2 value2
12// key3 value3
13
14// using for in - same output as above
15for (let key in obj) {
16 let value = obj[key];
17 console.log(key, value);
18}
1var p = {
2 "p1": "value1",
3 "p2": "value2",
4 "p3": "value3"
5};
6
7// for-in
8for (var key in p) {
9 if (p.hasOwnProperty(key)) {
10 console.log(key + " -> " + p[key]);
11 }
12}
13
14// for-of with Object.keys()
15for (var key of Object.keys(p)) {
16 console.log(key + " -> " + p[key])
17}
18
19// Object.entries()
20for (let [key, value] of Object.entries(p)) {
21 console.log(`${key}: ${value}`);
22}
1const obj = { a: 1, b: 2 };
2
3Object.keys(obj).forEach(key => {
4 console.log("key: ", key);
5 console.log("Value: ", obj[key]);
6} );
1Object.keys
2Object.values
3Object.entries
4
5const fruits = {
6 apple: 28,
7 orange: 17,
8 pear: 54,
9}
10
11const entries = Object.entries(fruits)
12console.log(entries)
13// [
14// [apple, 28],
15// [orange, 17],
16// [pear, 54]
17// ]