feat(vector3): add accessors for x, y, z (#54)

src/lib/Vector3.mjs

@@ -61,6 +61,39 @@ class Vector3 extends Float32Array {
     }
   }
 
+  /**
+   * @type {Number}
+   */
+  get x() {
+    return this[0];
+  }
+
+  set x(x) {
+    this[0] = x;
+  }
+
+  /**
+   * @type {Number}
+   */
+  get y() {
+    return this[1];
+  }
+
+  set y(y) {
+    this[1] = y;
+  }
+
+  /**
+   * @type {Number}
+   */
+  get z() {
+    return this[2];
+  }
+
+  set z(z) {
+    this[2] = z;
+  }
+
   /**
    * Add given vector v to this vector.
    *

src/spec/Vector3.spec.js

@@ -16,6 +16,54 @@ describe('Vector3', () => {
     });
   });
 
+  describe('prototype.x', () => {
+    test('gets x component', () => {
+      const vector = Vector3.of(1.0, 2.0, 3.0);
+
+      expect(vector.x).toEqual(1.0);
+    });
+
+    test('sets x component', () => {
+      const vector = Vector3.of(1.0, 2.0, 3.0);
+
+      vector.x = 4.0;
+
+      expect(vector.x).toEqual(4.0);
+    });
+  });
+
+  describe('prototype.y', () => {
+    test('gets y component', () => {
+      const vector = Vector3.of(1.0, 2.0, 3.0);
+
+      expect(vector.y).toEqual(2.0);
+    });
+
+    test('sets y component', () => {
+      const vector = Vector3.of(1.0, 2.0, 3.0);
+
+      vector.y = 4.0;
+
+      expect(vector.y).toEqual(4.0);
+    });
+  });
+
+  describe('prototype.z', () => {
+    test('gets z component', () => {
+      const vector = Vector3.of(1.0, 2.0, 3.0);
+
+      expect(vector.z).toEqual(3.0);
+    });
+
+    test('sets z component', () => {
+      const vector = Vector3.of(1.0, 2.0, 3.0);
+
+      vector.z = 4.0;
+
+      expect(vector.z).toEqual(4.0);
+    });
+  });
+
   describe('prototype.add()', () => {
     test('returns expected result when adding positive vector', () => {
       const vector1 = Vector3.of(1.0, 2.0, 3.0);