Nested Loops In JavaScript

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Nested Loops In JavaScript

Nested loops in JavaScript are a way to use multiple loops within one another. They are useful for performing complex operations and can be used to iterate through multi-dimensional arrays or to perform operations that involve multiple variables.

What Is A Nested Loop?

A nested loop is simply a loop that is placed within another loop. The outer loop is called the parent loop, and the inner loop is called the child loop. The child loop will run to completion for each iteration of the parent loop. Here is an example of a nested for loop that will iterate through a 2D array:

let myArray = [[1, 2], [3, 4], [5, 6]];

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

In this example, the outer loop is controlled by the variable i and iterates over the rows of the array, while the inner loop is controlled by the variable j and iterates over the elements within each row. The inner loop will run to completion for each iteration of the outer loop.

It is also possible to nest different types of loops. For example, you could nest a for loop inside a while loop or vice versa. Here is an example of a nested for loop inside a while loop:

let i = 0;
while (i < 3) {
    for (let j = 0; j < 2; j++) {
        console.log(i, j);
    }
    i++;
}

Explanation

In this example, the while loop is controlled by the variable i and runs for three iterations, for each iteration, the inner for loop runs, controlled by the variable j and runs 2 iterations, printing the values of i and j each time

It’s important to keep in mind that nested loops can greatly increase the complexity of your code and can also impact performance. It’s important to use them wisely and to test your code to ensure that it performs well.

Conclusion

Overall, nested loops are a powerful feature in JavaScript that can be used to perform complex operations. They can be used to iterate through multi-dimensional arrays, perform operations involving multiple variables, and more.