Algorithm to rotate a matrix by 90° (not in place rotation)

main.go

func RotateClockWiseNIP(matrix [][]int) (out [][]int) {
	// Create and populate a new out matrix full of zero
	for i := 0; i < len(matrix); i++ {
		out = append(out, []int{})
		for j := 0; j < len(matrix); j++ {
			out[i] = append(out[i], 0)
		}
	}
	// Change values accordingly
	for row := 0; row < len(matrix); row++ {
		for col := 0; col < len(matrix); col++ {
			out[col][len(matrix)-1-row] = matrix[row][col]
		}
	}
	return
}