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memory.js
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44 lines (40 loc) · 1.1 KB
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'use strict';
const validatePoint = (x, y) => {
const errors = [];
if (!Number.isFinite(x)) errors.push(new TypeError(`Invalid x: ${x}`));
if (!Number.isFinite(y)) errors.push(new TypeError(`Invalid y: ${y}`));
return errors;
};
const createPoint = (x, y) => {
const errors = validatePoint(x, y);
if (errors.length > 0) {
const cause = new AggregateError(errors, 'Validation');
throw new RangeError('Bad coordinates', { cause });
}
const SIZE = 8;
const buffer = new SharedArrayBuffer(SIZE);
const view = new Int32Array(buffer);
view[0] = x;
view[1] = y;
const move = (dx, dy) => {
Atomics.add(view, 0, dx);
Atomics.add(view, 1, dy);
};
const clone = () => {
const x = Atomics.load(view, 0);
const y = Atomics.load(view, 1);
return createPoint(x, y);
};
const toString = () => {
const x = Atomics.load(view, 0);
const y = Atomics.load(view, 1);
return `(${x}, ${y})`;
};
return { move, clone, toString };
};
// Usage
const p1 = createPoint(10, 20);
console.log(p1.toString());
const c1 = p1.clone();
c1.move(-5, 10);
console.log(c1.toString());