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prototype-object.js
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44 lines (39 loc) · 991 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: ${y}`));
return errors;
};
const PointPrototype = {
move(dx, dy) {
this.x += dx;
this.y += dy;
},
clone() {
return Object.create(PointPrototype, {
x: { value: this.x, writable: true },
y: { value: this.y, writable: true },
});
},
toString() {
return `(${this.x}, ${this.y})`;
},
};
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 = Object.create(PointPrototype);
point.x = x;
point.y = y;
return point;
};
// Usage
const p1 = createPoint(10, 20);
console.log(p1.toString());
const c1 = p1.clone();
c1.move(-5, 10);
console.log(c1.toString());