closures & prototypal inheritance

Author: CoreyScript

ClosuresPrototypalInheritance.md

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+# Closures and Prototypal Inheritance
+
+## Functions are first class citizens
+
+- Functions can be assigned to variables and properties of objects.
+
+```javascript
+const stuff = function() {};
+```
+
+- You can pass functions as arguments into a function.
+
+```javascript
+function something(fn) {
+  fn();
+}
+
+something(function() {
+  console.log("hi");
+}); // => 'hi'
+```
+
+- You can return functions as values from other functions.
+
+```javascript
+function a() {
+  return function b() {
+    console.log("bye");
+  };
+}
+
+a()(); // => 'bye'
+```
+
+## Higher Order Functions
+
+Higher order functions are simply functions that can take a function as an argument, or a function that returns another function.