forin loop in js code example

Example 1: javascript for loop

var colors=["red","blue","green"];
for (let i = 0; i < colors.length; i++) { 
  console.log(colors[i]);
}

Example 2: for loop in javascript

For printing 0 to 9

you can write like below also
var i;
for (i = 0; i < 10; i++) {
  console.log(i);
}

Example 3: for loop js

let arr = [];
for(let i = 0; i <= 10; i++){
arr[i] = Math.round(Math.random() * 10);
}
•	Result: [3, 1, 1, 2, 3, 9, 5, 6, 6, 8, 5] 
•	                        Or
let arr = [];
for(let i = 0; i <= 10; i++){
arr[i] = Math.trunc(Math.random() * 10);
} 
Result[7, 6, 0, 2, 4, 8, 7, 5, 5, 6, 5]

Example 4: javascript loop through array

// looping through an array in javascript using our own myEach function

// Write an `Array.prototype.myEach(callback)` method that invokes a callback
// for every element in an array and returns undefined.
Array.prototype.myEach = function(callback) {
    for (let i = 0 ; i < this.length ; i ++) {
        callback(this[i]);
    }
}

let array = ['Item 1', 'Item 2', 'Item 3', 'Item 4'];

array.myEach(function (element) {
	console.log(element); // this will print each element in the array
    // Code to do something to each element in the array
});

Example 5: for in js loop

Example:
const object = { a: 1, b: 2, c: 3 };

for (const property in object) {
  console.log(`${property}: ${object[property]}`);
}

// expected output:
// "a: 1"
// "b: 2"
// "c: 3"


Syntax:
for (variable in object)
  statement