Added files d-create-function and e-timeout-callback as home work.

JavaScript/d-create-function.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const wrap = (before, after, fn) => {
+  const args = [];
+  for (let i = 1; i <= fn.length; i++) {
+    args.push(`a${i}`);
+  }
+  global.fn = fn;
+  global.before = before;
+  global.after = after;
+  const createFn = new Function(...args, `
+    return after(fn(...before(${args.join(', ')})));
+  `);
+  return createFn;
+};
+
+// Usage
+
+const func = (par1, par2) => {
+  console.dir({ par1, par2 });
+  return [par1, par2];
+};
+
+const before = (...args) => {
+  console.log('before');
+  return args;
+};
+
+const after = res => {
+  console.log('after');
+  return res;
+};
+
+const wrapped = wrap(before, after, func);
+const res = wrapped('Uno', 'Due');
+console.dir({
+  res,
+  func: func.length,
+  wrapped: wrapped.length,
+});