Javascript For Loop

Javascript for loop

Created By: chatGPT

A for loop in JavaScript is used to execute a block of code a specific number of times. It consists of three main parts: initialization, condition, and increment. Let's break down each part for a clearer understanding.

Here's a simple example that demonstrates how to use a for loop to iterate through an array of numbers and log each number to the console.

const numbers = [1, 2, 3, 4, 5];

for (let i = 0; i < numbers.length; i++) {
    console.log(numbers[i]);
}

In this example, we initialize the loop with let i = 0, which sets the starting index. The loop continues to execute as long as i < numbers.length is true. After each iteration, we increment i by 1 with i++. During each loop, we access the current number using numbers[i] and log it to the console.

You can also use a for loop to calculate the sum of the numbers in the array. Here’s how you can do that:

let sum = 0;

for (let i = 0; i < numbers.length; i++) {
    sum += numbers[i];  // Add the current number to the sum
}

console.log(`The sum is: ${sum}`);

This code snippet initializes a variable sum to 0. Inside the loop, it adds each number from the numbers array to sum. Finally, it logs the total sum to the console using a template literal.

Another common use of the for loop is to nested loops. For example, if you want to create a multiplication table:

for (let i = 1; i <= 5; i++) {
    for (let j = 1; j <= 5; j++) {
        console.log(`${i} x ${j} = ${i * j}`);
    }
}

In this snippet, the outer loop iterates through numbers 1 to 5. For each iteration of the outer loop, the inner loop also runs from 1 to 5, generating a multiplication result, and logs it to the console in a formatted string.