rotateImage.js

rotateImage = a => a.map((row, rowIndex) => a.map(val => val[rowIndex]).reverse())

rotateImage.md

Note: Try to solve this task in-place (with O(1) additional memory), since this is what you'll be asked to do during an interview.

You are given an n x n 2D matrix that represents an image. Rotate the image by 90 degrees (clockwise).

Example

For

a = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] the output should be

rotateImage(a) = [[7, 4, 1], [8, 5, 2], [9, 6, 3]] Input/Output

[execution time limit] 4 seconds (js)

[input] array.array.integer a

Guaranteed constraints: 1 ≤ a.length ≤ 100, a[i].length = a.length, 1 ≤ a[i][j] ≤ 104.

[output] array.array.integer

[JavaScript (ES6)] Syntax Tips

// Prints help message to the console // Returns a string function helloWorld(name) { console.log("This prints to the console when you Run Tests"); return "Hello, " + name; }