Add static syntax examples

Author: dmitriz

examples/18-applicative.js

@@ -8,7 +8,7 @@ const res =
   // apply our wrapped function to the Box'ed value 2
   .ap(Box(2))
 
-// This uses switched order comparing 
+// This uses switched order comparing
 // to the Fantasy Land applicative spec
 // ap :: f a ~> f (a -> b) -> f b
 
@@ -34,3 +34,14 @@ const add = x => y => x + y
 
 console.log(liftA2(add, Box(2), Box(4)))
 // -> Box(6)
+
+console.log(liftA2(x => y => x - y, Box(2), Box(4)))
+// -> Box(-2)
+
+
+// static syntax
+// ap(Fg)(Fx, Fy)
+const ap = Fg => (Fx, Fy) => Fg.ap(Fx).ap(Fy)
+
+// liftA2cur(g)(Fx, Fy)
+const liftA2cur = g => (Fx, Fy) => liftA2(g, Fx, Fy)