Method extend4

examples/extern/gmath.bundle.js:757–759

(z, w8)

        return new Vector3(this.x, this.y, z);
    }
    extend4(z, w8) {
        return new Vector4(this.x, this.y, z, w8);
    }
    toString() {
        return `Vector2 { x: ${this[0]}, y: ${this[1]} }`;
    }