How to usenested loops in Javascript

Approach 2: Using array manipulation and join() method

In this approach Nested loops iterate through rows and columns, incrementing row count in the outer loop and column count inner loop, to print desired patterns or structures like right angled trangle.

Example: We are using nested loops to print a number pattern with increasing numbers on each line, up to the specified limit of 5.

Javascript

const n = 5;
for (let i = 1; i <= n; i++) {
    let str = '';
    for (let j = 1; j <= i; j++) {
        str += j + ' ';
    }
    console.log(str);
}

Output

JavaScript Program to Print Number Pattern

The idea of pattern-based programs is to understand the concept of nesting for loops and how and where to place the alphabet/numbers/stars to make the desired pattern.