Add recursive composition

tshemsedinov · tshemsedinov · commit b8ed7c40af4c · 2018-10-05T14:42:33.000+03:00
diff --git a/JavaScript/6-recursive.js b/JavaScript/6-recursive.js
@@ -0,0 +1,28 @@
+'use strict';
+
+const compose = (...fns) => (...args) => {
+  if (fns.length === 0) return args[0];
+  const fn = fns.shift();
+  const res = fn(...args);
+  if (fns.length === 0) return res;
+  return compose(...fns)(res);
+};
+
+// Usage
+
+const upperCapital = s => s.replace(
+  /\w+/g,
+  word => word.charAt(0).toUpperCase() + word.substr(1)
+);
+
+const lower = s => (typeof s === 'string' ? s.toLowerCase() : '');
+
+const trim = s => s.trim();
+
+const s = '   MARCUS AURELIUS   ';
+console.log(s);
+console.log('lower(' + s + ') = ' + lower(s));
+console.log('upperCapital(' + s + ') = ' + upperCapital(s));
+
+const capitalize = compose(trim, lower, upperCapital);
+console.log('capitalize(' + s + ') = ' + capitalize(s));
