Switch the dimensions of a two-dimensional array - Unable to assign a value to property '0' as it is undefined

Question

Switch the dimensions of a two-dimensional array - Unable to assign a value to property '0' as it is undefined

I'm currently working on a TypeScript code that transposes an M x N matrix:

private transpose(a: number[][]): number[][] {
    let m: number = a.length;
    let n: number = a[0].length;
    let b: number[][] = [[]]; // Attempted without "[[]]"
    for (let i: number = 0; i < m; i++) {
        for (let j: number = 0; j < n; j++) {
            b[j][i] = a[i][j]; // Encountering an Error
        }
    }
    return b;
}

Unfortunately, I am facing the following error:

Uncaught (in promise): TypeError: Cannot set property '0' of undefined

Is there a correct way to initialize the 2D array?

P.S. I have already tried using for..in, but it still presents issues

Any thoughts or solutions?

arrays typescript transpose

Answer 1

Answer №1

To achieve this, follow these steps:

let newArray: number[][] = [];
for (let index1: number = 0; index1 < size; index1++) {
    newArray[index1] = [];

    for (let index2: number = 0; index2 < length; index2++) {
        newArray[index1][index2] = originalArray[index2][index1];
    }
}

The process entails initializing an array and then creating a nested array in each iteration of the loop.

Answer 2

To achieve this, follow these steps:

let newArray: number[][] = [];
for (let index1: number = 0; index1 < size; index1++) {
    newArray[index1] = [];

    for (let index2: number = 0; index2 < length; index2++) {
        newArray[index1][index2] = originalArray[index2][index1];
    }
}

The process entails initializing an array and then creating a nested array in each iteration of the loop.

Switch the dimensions of a two-dimensional array - Unable to assign a value to property '0' as it is undefined

Answer №1

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