Added example from physics for ap function

Author: DzyubSpirit

JavaScript/6-functor-ap-fp.js

@@ -12,3 +12,24 @@ function maybe(x) {
 maybe(5)(x => x * 2)(x => ++x)(console.log);
 maybe(5)(x => x * 2).ap(maybe(x => ++x))(console.log);
 maybe(5).chain(x => maybe(x * 2))(x => ++x)(console.log);
+
+const config = {
+  coords: {
+    x: 0,
+    y: 5,
+  },
+  velocity: {
+    x: 1,
+    y: 1,
+  },
+};
+
+const addVelocity = velocity => coords => {
+  coords.x += velocity.x;
+  coords.y += velocity.y;
+  return coords;
+};
+
+const coords   = maybe(config.coords);
+const velocity = maybe(config.velocity);
+coords.ap(velocity(addVelocity))(console.log);