7 Loop Types in JavaScript.

In this Post, we'll go through different ways of Looping In Javascript with the help of examples.

• for
• while
• do-while
• forEach
• map
• for-of
• for-in

JavaScript for loop:

Example-

for (let i = 0; i < 5; i++) {
  text += "The number is " + i + "<br>";
}

JavaScript while loop:

Example-

while (i < 10) {
  text += "The number is " + i;
  i++;
}

JavaScript do-while loop:

Example-

do {
  text += "The number is " + i;
  i++;
}
while (i < 10);

JavaScript forEach loop:

Example-

let sum = 0;
const numbers = [65, 44, 12, 4];
numbers.forEach(myFunction);

function myFunction(item) {
  sum += item;
}

JavaScript map:

Example-

const cars = ['TaTa', 'Volvo', 'BMW'];

const newCars = cars.map((ele) => {
  return ele.toUpperCase()
});

JavaScript  for-of loop:

Example-

const cars = ['TaTa', 'Volvo', 'BMW'];

for (let ele of cars) {
   console.log(ele);
}

JavaScript for-in loop:

Example-

const person = {fname:"John", lname:"Doe", age:25};

let text = "";
for (let x in person) {
  text += person[x];
}

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