JavaScript Loops

Subject: JavaScript

Loops in JavaScript allow you to run a block of code multiple times, either a fixed number of times or until a condition becomes false. They are essential for tasks like iterating over arrays, calculating values repeatedly, or automating logic.

Types of Loops in JavaScript

JavaScript supports several types of loops:

1. for Loop

Syntax:

Example:

2. while Loop

Syntax:

Example:

3. do...while Loop

Syntax:

Example:

4. for...in Loop (Used for Objects)

5. for...of Loop (Used for Iterables)

When to Use Each Loop

  • Use for when you know the number of iterations in advance.
  • Use while when the number of iterations depends on a condition.
  • Use do...while when the loop body should run at least once.
  • Use for...in to loop over object properties.
  • Use for...of to loop over iterable items like arrays, strings, etc.

Key Takeaways

  • Loops allow repeated execution of code.
  • Select the right loop for your specific use case.
  • Use break to exit a loop early, and continue to skip to the next iteration.
  • Always ensure your loop conditions lead to termination to avoid infinite loops.
  • Practicing different loop types helps build stronger logic skills in programming.
Next : For Loop