If we want to extend a two-dimensional array without creating a new one, the following approach can be taken:
let array:number[][] = [
[5, 6],
];
We also have two other two-dimensional arrays named a1 and a2:
let a1:number[][] = [[1, 2], [3, 4]];
let a2:number[][] = [[7, 8], [9, 10]];
The task at hand is to insert a1 at the beginning and a2 at the end of array:
array.unshift(a1);
array.push(a2);
However, there are syntax errors preventing this, resulting in the following error messages:
Argument of type 'number[][]' is not assignable to parameter of type 'number[]'.
Type 'number[]' is not assignable to type 'number'.
The desired outcome should look like this:
[
[1, 2],
[3, 4],
[5, 6],
[7, 8],
[9, 10]
];
Is there a way in TypeScript/Javascript to insert these arrays without the need to iterate and manually unshift/push each individual element?
Note: Considering the possibility of a large existing array, it is preferred to avoid making copies (e.g. using concat or similar methods).