what is loop in js

Question

what is loop in js

Answer 1

In JavaScript, a loop is a programming construct that allows a section of code to be executed repeatedly until a certain condition is met. There are several types of loops in JavaScript:

1. for loop: It repeats a block of code a specific number of times. It consists of three parts: initialization, condition, and iteration statement.

Example:

for (let i = 0; i < 5; i++) {
  console.log(i);
}

2. while loop: It repeats a block of code as long as a specified condition evaluates to true.

Example:

let i = 0;
while (i < 5) {
  console.log(i);
  i++;
}

3. do-while loop: It is similar to the while loop, but the code block is executed first before checking the condition.

Example:

let i = 0;
do {
  console.log(i);
  i++;
} while (i < 5);

4. forEach loop: It is a method available for arrays to execute a provided function once for each element in the array.

Example:

const numbers = [1, 2, 3, 4, 5];
numbers.forEach(function(number) {
  console.log(number);
});

These loops are used to automate repetitive tasks or iterate over arrays and objects to perform operations on their elements.