javascript best way to loop through array

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 (var i = 0; i < colors.length; i++) {
3    console.log(colors[i]);
4}

1let my_array = [1, 2, 3, 4, 5];
2
3// standard for loop
4for(let i = 0; i < my_array.length; i++) {
5  console.log(my_array[i])  // 1 2 3 4 5 6
6}
7
8// for and of method
9for(let i of my_array) {
10	console.log(i)
11}
12
13/*
14Results:
151 2 3 4 5
161 2 3 4 5
17(From both methods)
18*/

1/* ES6 */
2const cities = ["Chicago", "New York", "Los Angeles"];
3cities.map(city => {
4	console.log(city)
5})
6

1var len = arr.length;
2while (len--) {
3    // blah blah
4}