Add Length Parameter to typed arrays #18471
Description
The goal is pretty straight forward, since typed arrays have a fixed length it would be a more accurate and helpful type it you could specify length. Then you could get complaints if you try to assign or access a higher index or use a array of the incorrect length.
Code
type Vector2d = Int32Array<2>;
type Vector3d = Int32Array<3>;
type Matrix = Int32Array<16>;
const add =
(vecA:Vector2d) =>
(vecB:Vector2d, target:Vector2d = new Int32Array(2) ):Vector2d => {
target[0] = vecA[0] + vecB[0];
target[1] = vecA[1] + vecB[1];
return target;
};
const add3d =
(vecA:Vector3d) =>
(vecB:Vector3d, target:Vector3d = new Int32Array(3) ):Vector3d => {
target[0] = vecA[0] + vecB[0];
target[1] = vecA[1] + vecB[1];
target[2] = vecA[2] + vecB[2];
return target;
};
const position = new Int32Array(2);
const position3d = new Int32Array(3);
const velocity = new Int32Array([1,1]);
const velocity3d = new Int32Array([1,2,3]);
add(position)(velocity, position);
const newPosition = add(position)(velocity);
add3d(position3d)(velocity3d, position3d);
add(position3d)(velocity3d, position3d); // Fails due to incorrect array length