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Sorting only columns of a 2-D array in JavaScript
We are required to write a JavaScript function that takes in a two-dimensional array of integers as the only argument.
The function should sort the elements present at the column of the array in increasing or decreasing order.
For example −
If the input array is −
const arr = [ [6, 2, 9], [8, 1, 4], [5, 3, 7] ];
Then the array should be sorted like this −
const output = [ [8, 3, 9], [6, 2, 7], [5, 1, 4] ];
Example
Following is the code −
const arr = [
[6, 2, 9],
[8, 1, 4],
[5, 3, 7]
];
const sortColumns = (arr = []) => {
const transpose = (matrix = []) => {
const res = [];
for (let row = 0; row < matrix.length; row++) {
for (let col = 0; col < matrix[row].length; col++) {
if(!res[col]){
res[col] = [];
}
res[col][row] = matrix[row][col];
}
}
return res;
};
arr = transpose(arr);
for (let row = 0; row < arr.length; row++) {
arr[row].sort((a, b) => b - a);
}
return transpose(arr);
};
console.log(sortColumns(arr));Output
Following is the console output −
[ [ 8, 3, 9 ], [ 6, 2, 7 ], [ 5, 1, 4 ] ]
Updated on: 23-Jan-2021
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