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mixin.js
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48 lines (41 loc) · 1.02 KB
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'use strict';
const Movable = {
move(dx, dy) {
this.x += dx;
this.y += dy;
return this;
},
};
const Clonable = {
clone() {
const prototype = Object.getPrototypeOf(this);
const cloned = Object.create(prototype);
return Object.assign(cloned, this);
},
};
const Serializable = {
toString() {
return `(${this.x}, ${this.y})`;
},
};
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 point = { x, y };
return Object.assign(point, Movable, Clonable, Serializable);
};
// Usage
const p1 = createPoint(10, 20);
console.log(p1.toString());
const c1 = p1.clone();
c1.move(-5, 10);
console.log(c1.toString());