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}

1var arr = ["f", "o", "o", "b", "a", "r"]; 
2for(var i in arr){
3	console.log(arr[i]);
4}

1var txt = "";
2var numbers = [45, 4, 9, 16, 25];
3
4numbers.forEach(function(value, index, array) {
5  txt = txt + value + "<br>";
6});
7

1array = [ 1, 2, 3, 4, 5, 6 ]; 
2for (index = 0; index < array.length; index++) { 
3    console.log(array[index]); 
4} 

1let arbitraryArr = [1, 2, 3];
2// below I choose let, but var and const can also be used 
3for (let arbitraryElementName of arbitraryArr) {
4  console.log(arbitraryElementName);
5}