javascript foreach object

1const students = {
2  adam: {age: 20},
3  kevin: {age: 22},
4};
5
6Object.entries(students).forEach(student => {
7  // key: student[0]
8  // value: student[1]
9  console.log(`Student: ${student[0]} is ${student[1].age} years old`);
10});
11/* Output:
12Student: adam is 20 years old
13Student: kevin is 22 years old
14*/

1const obj = {
2  name: 'Jean-Luc Picard',
3  rank: 'Captain'
4};
5
6// Prints "name Jean-Luc Picard" followed by "rank Captain"
7Object.keys(obj).forEach(key => {
8  console.log(key, obj[key]);
9});

1const obj = {
2  name: 'Jean-Luc Picard',
3  rank: 'Captain'
4};
5
6// Prints "name Jean-Luc Picard" followed by "rank Captain"
7Object.entries(obj).forEach(entry => {
8  const [key, value] = entry;
9  console.log(key, value);
10});

1const list = {
2  key: "value",
3  name: "lauren",
4  email: "lauren@notreally.com",
5  age: 30
6};
7
8// Object.keys returns an array of the keys
9// for the object passed in as an argument.
10
11Object.keys(list).forEach(val => {
12  let key = val;
13  let value = list[val];
14  console.log(`${key} : ${value}`);
15});
16
17// Returns:
18// "key : value"
19// "name : lauren";
20// "email : lauren@notreally.com"
21// "age : 30"
22

1/* Answer to: "foreach object javascript" */
2
3const games = {
4  "Fifa": "232",
5  "Minecraft": "476"
6  "Call of Duty": "182"
7};
8
9Object.keys(games).forEach((item, index, array) => {
10  let msg = `There is a game called ${item} and it has sold ${games[item]} million copies.`;
11  console.log(msg);
12});
13
14/*
15  The foreach statement can be used in many ways and with object can make
16  development a lot easier.
17  
18  A link for for more information on this can be found below and in the source:
19  https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach
20*/

1function logArrayElements(element, index, array) {
2  console.log('a[' + index + '] = ' + element)
3}
4
5// Notice that index 2 is skipped, since there is no item at
6// that position in the array...
7[2, 5, , 9].forEach(logArrayElements)
8// logs:
9// a[0] = 2
10// a[1] = 5
11// a[3] = 9
12