Loops in JavaScript

Loops are a fundamental concept in programming used to execute a block of code repeatedly based on a condition. JavaScript offers several types of loops such as for, while, and do-while, each serving different purposes depending on the situation.

Types of Loops in JavaScript:

• for loop: A traditional loop that repeats a block of code a set number of times.
• while loop: A loop that repeats as long as a specified condition is true.
• do-while loop: A loop that executes at least once before checking the condition.
• for...in loop: Used to iterate over properties of an object.
• for...of loop: Used to iterate over iterable objects like arrays, strings, etc.

Syntax of Loops:

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

Example of for loop in JavaScript:

This example uses a for loop to print numbers from 0 to 4.

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

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

Example of while loop in JavaScript:

This example uses a while loop to print numbers from 0 to 4.

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

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

Example of do-while loop in JavaScript:

This example uses a do-while loop to print numbers from 0 to 4. The loop will run at least once even if the condition is initially false.

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

Key Points on Loops:

• for loop: It is typically used when the number of iterations is known beforehand.
• while loop: It is ideal when the number of iterations is not known, and the loop continues as long as the condition is true.
• do-while loop: Useful when you want the code to execute at least once, regardless of the condition.
• Break: The break statement can be used to exit the loop before it has finished all iterations.
• Continue: The continue statement can be used to skip the current iteration and move to the next iteration of the loop.