Question

How to get column from 2D array (matrix) in JavaScript

Answer 1

function getColumn(matrix, col) {
       let column = [];
       
       for (let i=0; i<matrix.length; i++){
          column.push(matrix[i][col]);
       }
       
       return column;
}


const arr = [
  [1, 2, 3, 0, 10],
  [4, 5, 6, 13, 11],
  [7, 8, 9, 14, 12]
];

const column = getColumn(arr, 1);

console.log(column);

  
    
    
    
/*
run:
    
[2, 5, 8]
    
*/

 

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Answer 2

const arr = [
  [1, 2, 3, 0, 10],
  [4, 5, 6, 13, 11],
  [7, 8, 9, 14, 12]
];

const column = arr.map(function(value,index) { return value[1]; });

console.log(column);

  
    
    
    
/*
run:
    
[2, 5, 8]
    
*/

 

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