JavaScript Program to Print Pyramid Pattern by using Numbers Last Updated : 16 Jan, 2024 Comments Improve Suggest changes Like Article Like Report A pyramid pattern using numbers is a sequence of numbers arranged in a triangular shape, with each row displaying incrementing or decrementing numbers, creating a visually structured pattern. Example: 1 1 2 3 1 2 3 4 5 1 2 3 4 5 6 71 2 3 4 5 6 7 8 9ApproachWe initialize a variable n with the value 5. This variable determines the number of rows in the pattern.We use a for loop with the variable i to iterate from 1 to n (inclusive). This loop controls the rows of the pattern.Inside the outer loop, there's another for loop with the variable j, iterating from 1 to 2 * n (twice the number of columns). This loop controls the columns of the pattern.we use Conditional logic to checks if (i + j >= n + 1 && i >= j - n + 1) for number or gap. Numbers increment; otherwise, two spaces are added.After the inner loop, print str (one row). Repeat for each i, forming the desired pattern.Example 1: We are using the above-explained approach. JavaScript let n = 5; for (let i = 1; i <= n; i++) { let str = ''; let count = 1; for (let j = 1; j <= 2 * n; ++j) { if (i + j >= n + 1 && (i >= j - n + 1)) { // Add a space after each number str += count.toString() + ' '; count++; } else { // Add two spaces for the gap str += ' '; } } console.log(str); } Output 1 1 2 3 1 2 3 4 5 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 9 Example 2: We are making Pyramid pattern by using number in left direction. JavaScript let n = 5; for (let i = 1; i <= n; i++) { let str = ''; let count = 1; for (let j = 1; j <= n; ++j) { if (i + j >= 1 + n && j <= n) { // Add a space after each number str += count.toString() + ' '; count += 1; } else { // Add two spaces for the gap str += ' '; } } console.log(str); }; for (let i = n - 1; i >= 1; i--) { let str = ''; let count = 1; for (let j = 1; j <= n; ++j) { if (i + j >= 1 + n && j <= n) { // Add a space after each number str += count.toString() + ' '; count += 1; } else { // Add two spaces for the gap str += ' '; } } console.log(str); }; Output 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 1 2 3 4 1 2 3 1 2 1 Example 3: We are making Pyramid pattern by using numbers in right direction. JavaScript let n = 5; for (let i = 1; i <= n; i++) { let str = ""; let count = 1; // Add numbers for (let k = 1; k <= i; k++) { str = count.toString() + " " + str; count += 1; } // Add spaces after numbers for (let j = i; j < n; j++) { str += " "; } console.log(str); } for (let i = n - 1; i >= 1; i--) { let str = ""; let count = 1; // Add numbers for (let k = 1; k <= i; k++) { str = count.toString() + " " + str; count += 1; } // Add spaces after numbers for (let j = i; j < n; j++) { str += " "; } console.log(str); }; Output1 2 1 3 2 1 4 3 2 1 5 4 3 2 1 4 3 2 1 3 2 1 2 1 1 Example 4: We are generated number pyramid in down-ward direction. JavaScript let n = 5; for (let i = n; i >= 1; i--) { let str = ''; let count = 1; for (let j = 1; j <= 2 * n; ++j) { if (i + j >= n + 1 && (i >= j - n + 1)) { // Add a space after each number str += count.toString() + ' '; count++; } else { // Add two spaces for the gap str += ' '; } } console.log(str); }; Output1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 1 2 3 4 5 1 2 3 1 Example 5: We are generating Inverted Half Pyramid JavaScript function printInvertedHalfPyramid(rows) { for (let i = rows; i >= 1; i--) { let row = ''; for (let j = 1; j <= i; j++) { row += j + ' '; } console.log(row); } } // Example usage for an inverted half pyramid with 5 rows printInvertedHalfPyramid(5); Output1 2 3 4 5 1 2 3 4 1 2 3 1 2 1 Comment More infoAdvertise with us Next Article JavaScript Program to Print Pyramid Pattern by using Numbers V vishalkumar2204 Follow Improve Article Tags : JavaScript Web Technologies JavaScript-DSA JavaScript-Program Similar Reads JavaScript Program to Print Floyd’s Pattern Triangle Pyramid Floyd's Triangle is a right-angled triangular array of natural numbers, used primarily in computer science education. 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