its a n x n 2d matrix representing an image ,how to rotate the image by 90deg [[1,2,3],[4,5,6],[7,8,9]] to [[7,4,1],[8,5,2],[9,6,3]]?`
function rotate(matrix){
for(let r=0;r<matrix.length;r++){
for(let c=r;c<matrix[0].length;c++){
[matrix[r][c],matrix[c][r]] = [matrix[c][r],matrix[r][c]]
}
}
for(row of matrix){
return row.reverse()
}
}
console.log(rotate([[1,2,3],[4,5,6],[7,8,9]]))the output is only showing [7,4,1]
You have an unconditional return statement in a loop. That doesn't make sense. The function always returns the first row.reverse(). Move th return statement out of the loop:
function rotate(matrix){
for(let r=0;r<matrix.length;r++){
for(let c=r;c<matrix[0].length;c++){
[matrix[r][c],matrix[c][r]] = [matrix[c][r],matrix[r][c]]
}
}
for(row of matrix){
row.reverse()
}
return matrix;
}
console.log(rotate([[1,2,3],[4,5,6],[7,8,9]]))