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fp.js
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30 lines (25 loc) · 845 Bytes
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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: ${y}`));
return errors;
};
const createPoint = (x, y) => {
const errors = validatePoint(x, y);
if (errors.length > 0) {
const cause = new AggregateError(errors, 'Validation');
throw new RangeError('Bad coordinates', { cause });
}
return Object.freeze({ x, y });
};
const move = ({ x, y }, dx, dy) => createPoint(x + dx, y + dy);
const clone = (point) => createPoint(point.x, point.y);
const toString = (point) => `(${point.x}, ${point.y})`;
// Usage
const p1 = createPoint(10, 20);
console.log(toString(p1));
const c0 = clone(p1);
console.log(toString(c0));
const c1 = move(p1, -5, 10);
console.log(toString(c1));