psiphi75/hidden-classes.js

## hidden-classes.js
fuction vector(x, y) {
    this.x = x;
    this.y = y;
}

const a = new vector(1, 2);
const b = new vector(3, 4);    // OKAY: b has the same hidden class as a
b.z = 5;                        // BAD: b now has a different hidden class
	fuction vector(x, y) {
	this.x = x;
	this.y = y;
	}

	const a = new vector(1, 2);
	const b = new vector(3, 4); // OKAY: b has the same hidden class as a
	b.z = 5; // BAD: b now has a different hidden class