September Morn Update

Task/Function-composition/TypeScript/function-composition.type

@@ -0,0 +1,14 @@
+function compose<T, U, V> (fn1: (input: T) => U, fn2: (input: U) => V){
+    return function(value: T) {
+        return fn2(fn1(value))
+    }
+}
+
+function size (s: string): number { return s.length; }
+
+function isEven(x: number): boolean { return x % 2 === 0; }
+
+const evenSize = compose(size, isEven);
+
+console.log(evenSize("ABCD")) // true
+console.log(evenSize("ABC")) // false