Question

How to convert a 2D array to a 1D array in TypeScript

Answer 1

function arr2DTo1D(arr2d: number[][]) {
    const arr: number[] = new Array(arr2d.length * arr2d[0].length);
    let k: number = 0;
     
    for (let i: number = 0; i < arr2d.length; i++) {
        for (let j: number = 0; j < arr2d[i].length; j++) {
            arr[k++] = arr2d[i][j];
        }
    }
     
    return arr;
}
 
const arr2d: number[][] = [ 
    [ 5, 6, 1, 4 ], 
    [ 3, 8, 0, 2 ],
    [ 9, 2, 7, 3 ] 
];
 
const arr = arr2DTo1D(arr2d);
 
console.log(arr);
  
  
   
/*
run
  
[5, 6, 1, 4, 3, 8, 0, 2, 9, 2, 7, 3] 
   
*/

 

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