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Diagonal Difference (HackerRank)
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| // Without reduce | |
| function diagonalDifference(arr) { | |
| let sum = 0; | |
| for (let i = 0; i <= arr.length - 1; i++) { | |
| sum += arr[i][i] - arr[i].reverse()[i]; | |
| } | |
| return Math.abs(sum); | |
| } | |
| // With reduce | |
| function diagonalDifference(arr) { | |
| return Math.abs(arr.reduce((acc, array, i) => acc += array[i] - array.reverse()[i], 0)); | |
| } | |
| // Verify square matrix | |
| const matrix = Array(4).fill(Array(4).fill(0)); | |
| function isSquare(elem, index, array) { | |
| return elem.length == array.length; | |
| } |
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