JavaScript Loops

Loops are a fundamental concept in programming that allow you to repeatedly execute a block of code.

Types of Loops in JavaScript:

1. for Loop:

   • Syntax:
     JavaScript

      

     for (initialization; condition; increment/decrement) {
       // Code to be executed repeatedly
     }
     

   • Example:
     JavaScript

      

     for (let i = 0; i < 5; i++) {
       console.log(i); // Output: 0 1 2 3 4
     }
     

2. while Loop:

   • Syntax:
     JavaScript

      

     while (condition) {
       // Code to be executed repeatedly
     }
     

   • Example:
     JavaScript

      

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

3. do...while Loop:

   • Syntax:
     JavaScript

      

     do {
       // Code to be executed repeatedly
     } while (condition);
     

   • Example:
     JavaScript

      

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

4. for...of Loop:

   • Iterates over the elements of an iterable object (like an array).
   • Syntax:
     JavaScript

      

     for (const element of iterable) {
       // Code to be executed for each element
     }
     

   • Example:
     JavaScript

      

     const fruits = ["apple", "banana", "orange"];
     for (const fruit of fruits) {
       console.log(fruit); 
     }
     

5. for...in Loop:  

    
   • Iterates over the properties of an object.
   • Syntax:
     JavaScript

      

     for (const property in object) {
       console.log(property, object[property]); 
     }
     

Key Considerations:

• Choose the Right Loop: Select the appropriate loop type based on your specific needs and the structure of your data.
• Loop Conditions: Ensure that the loop condition will eventually become false to avoid infinite loops.
• Break and Continue: Use the break statement to exit a loop prematurely and the continue statement to skip the current iteration and move to the next.  
   

Loops are essential for performing repetitive tasks in JavaScript, such as iterating over arrays, processing data, and generating patterns.