TypeScript Tutorials

How to print Hollow Diamond Pattern in TypeScript

◀ Previous Next ▶

How to print Hollow Diamond Pattern in TypeScript ?

Answer

To print a Hollow Diamond Pattern in TypeScript, we use nested loops to manage spaces and stars.

✐ Examples

1 Print Hollow Diamond Pattern in TypeScript

In this example,

We define the number of rows for the diamond pattern, assuming it to be 5.
We use nested loops where the outer loop controls the rows and the inner loop manages spaces and stars.
Conditions within the loops determine when to print stars to create the hollow diamond effect.
The outer loop manages the rows of the diamond, incrementing and decrementing based on the midpoint of the diamond.
The inner loop calculates the spaces required to position the stars correctly, ensuring the hollow diamond pattern.
Stars are printed based on conditions to achieve the desired hollow diamond pattern.

TypeScript Program

// Print Hollow Diamond Pattern in TypeScript
function printHollowDiamond(numRows: number): string {
    const diamond: string[] = [];
    for (let row = 1; row <= numRows; row++) {
        let pattern = '';
        for (let space = 1; space <= numRows - row; space++) {
            pattern += ' ';
        }
        for (let star = 1; star <= 2 * row - 1; star++) {
            if (star === 1 || star === 2 * row - 1) {
                pattern += '*';
            } else {
                pattern += ' ';
            }
        }
        diamond.push(pattern);
    }

    for (let row = numRows - 1; row >= 1; row--) {
        let pattern = '';
        for (let space = 1; space <= numRows - row; space++) {
            pattern += ' ';
        }
        for (let star = 1; star <= 2 * row - 1; star++) {
            if (star === 1 || star === 2 * row - 1) {
                pattern += '*';
            } else {
                pattern += ' ';
            }
        }
        diamond.push(pattern);
    }

    return diamond.join('\n');
}

console.log(printHollowDiamond(5));

Output

    *
   * *
  *   *
 *     *
*       *
 *     *
  *   *
   * *
    *

Summary

In this tutorial, we learned How to print Hollow Diamond Pattern in TypeScript language with well detailed examples.