1var data = [1, 2, 3, 4, 5, 6];
2
3// traditional for loop
4for(let i=0; i<=data.length; i++) {
5 console.log(data[i]) // 1 2 3 4 5 6
6}
7
8// using for...of
9for(let i of data) {
10 console.log(i) // 1 2 3 4 5 6
11}
12
13// using for...in
14for(let i in data) {
15 console.log(i) // Prints indices for array elements
16 console.log(data[i]) // 1 2 3 4 5 6
17}
18
19// using forEach
20data.forEach((i) => {
21 console.log(i) // 1 2 3 4 5 6
22})
23// NOTE -> forEach method is about 95% slower than the traditional for loop
24
25// using map
26data.map((i) => {
27 console.log(i) // 1 2 3 4 5 6
28})
1var colors=["red","blue","green"];
2for (let i = 0; i < colors.length; i++) {
3 console.log(colors[i]);
4}
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}
1for (var property in object) {
2 if (object.hasOwnProperty(property)) {
3 // Do things here
4 }
5}
6
1var i; //defines i
2for (i = 0; i < 5; i++) { //starts loop
3 console.log("The Number Is: " + i); //What ever you want
4}; //ends loop
5//Or:
6console.log("The Number Is: " + 0);
7console.log("The Number Is: " + 1);
8console.log("The Number Is: " + 2);
9console.log("The Number Is: " + 3);
10console.log("The Number Is: " + 4);
11//They do the same thing!
12//Hope I helped!
1let str = '';
2
3for (let i = 0; i < 9; i++) {
4 str = str + i;
5}
6
7console.log(str);
8// expected output: "012345678"
9