Rotating a 2-D (transposing a matrix) in JavaScript

Transpose:

The transpose of a matrix (2-D array) is simply a flipped version of the original matrix (2-D array). We can transpose a matrix (2-D array) by switching its rows with its columns.

Example

The code for this will be −

const arr = [
   [1, 1, 1],
   [2, 2, 2],
   [3, 3, 3],
];
const transpose = arr => {
   for (let i = 0; i < arr.length; i++) {
      for (let j = 0; j < i; j++) {
         const tmp = arr[i][j];
         arr[i][j] = arr[j][i];
         arr[j][i] = tmp;
      };
   }
}
transpose(arr);
console.log(arr);

Output

The output in the console −

[ [ 1, 2, 3 ], [ 1, 2, 3 ], [ 1, 2, 3 ] ]

AmitDiwan

Published on 15-Oct-2020 09:18:44

• Related Questions & Answers
• Print a 2 D Array or Matrix in C#
• Print a 2 D Array or Matrix in Java Programming
• Validating a square in a 2-D plane in JavaScript
• Finding transpose of a 2-D array JavaScript
• Searching in a sorted 2-D array in JavaScript
• Reshaping 2-D array in JavaScript
• Sorting only columns of a 2-D array in JavaScript
• Build maximum array based on a 2-D array - JavaScript
• Emulating a 2-d array using 1-d array in C++
• Print the corner elements and their sum in a 2-D matrix in C Program.
• Equality of two 2-D arrays - JavaScript
• Finding distance between two points in a 2-D plane using JavaScript
• Grouping and sorting 2-D array in JavaScript
• Converting object to 2-D array in JavaScript
• Take in two 2-D arrays of numbers and returns their matrix multiplication result- JavaScript