1Object.entries(obj).forEach(
2    ([key, value]) => console.log(key, value)
3);

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}

1// Looping through arrays created from Object.keys
2const keys = Object.keys(fruits)
3for (const key of keys) {
4  console.log(key)
5}
6
7// Results:
8// apple
9// orange
10// pear
11

1var obj = { first: "John", last: "Doe" };
2
3Object.keys(obj).forEach(function(key) {
4    console.log(key, obj[key]);
5});

1/Example 1: Loop Through Object Using for...in
2// program to loop through an object using for...in loop
3
4const student = { 
5    name: 'John',
6    age: 20,
7    hobbies: ['reading', 'games', 'coding'],
8};
9
10// using for...in
11for (let key in student) { 
12    let value;
13
14    // get the value
15    value = student[key];
16
17    console.log(key + " - " +  value); 
18} 
19
20/Output
21	name - John
22	age - 20
23	hobbies - ["reading", "games", "coding"]
24
25//If you want, you can only loop through the object's
26//own property by using the hasOwnProperty() method.
27
28if (student.hasOwnProperty(key)) {
29    ++count:
30}
31
32/////////////////////////////////////////
33
34/Example 2: Loop Through Object Using Object.entries and for...of
35// program to loop through an object using for...in loop
36
37const student = { 
38    name: 'John',
39    age: 20,
40    hobbies: ['reading', 'games', 'coding'],
41};
42
43// using Object.entries
44// using for...of loop
45for (let [key, value] of Object.entries(student)) {
46    console.log(key + " - " +  value);
47}
48/Output
49	name - John
50	age - 20
51	hobbies - ["reading", "games", "coding"]
52
53//In the above program, the object is looped using the
54//Object.entries() method and the for...of loop.
55
56//The Object.entries() method returns an array of a given object's key/value pairs.
57//The for...of loop is used to loop through an array.
58
59//////////////////////////////////////////////////////////