Stack3web
diff --git a/‎09-An-Advanced-Look-at-Functions/01/01.js‎
Lines changed: 39 additions & 2 deletions b/‎09-An-Advanced-Look-at-Functions/01/01.js‎
Lines changed: 39 additions & 2 deletions
diff --git a/‎09-An-Advanced-Look-at-Functions/README.md‎
Lines changed: 22 additions & 3 deletions b/‎09-An-Advanced-Look-at-Functions/README.md‎
Lines changed: 22 additions & 3 deletions
@@ -100,9 +100,9 @@ console.log(doubleArr([1, 2, 3]))
  */
 
 // ******************************
-//  Lexical Scope******************************
+//  Lexical Scope ******************************
 // Example 9
-
+/*
 function outer() {
   let movie = 'Amadeus'
 
@@ -178,3 +178,40 @@ function TodoList() {
   
   }
 }
+*/
+
+// ******************************
+//  Function Expressions ******************************
+// Example 14
+console.log('\n')
+// this on it's own is not valid, we can't call this
+// We have no way of referring to this function
+// This is called an anonymous function
+// function(x, y) {
+//   return x + y
+// }
+function add(x, y) {
+  return x + y
+}
+
+// Anonymous function expression
+const sum = function (x, y) {
+  return x + y
+}
+
+// Named function expression
+const product = function multiply(x, y) {
+  return x * y
+}
+
+// They work exactly the same way, but we declared them
+// in two different format, two different syntaxes
+console.log(add(1, 99))
+console.log(sum(1, 99))
+// console.log(multiply(1, 99)) // Error: multiply is not defined
+console.log(product(1, 99))
+
+// Inspect the function
+console.dir(add)
+console.dir(sum)
+console.dir(product)
@@ -92,7 +92,7 @@ if (true) {
 
 **I cannot redeclared the same variable with the same name in the same scope**.
 
-### Lexical Scope
+## 3. Lexical Scope
 
 If i have a nested function like the one i have, here are the two functions i have outer and inside.
 
@@ -110,7 +110,7 @@ function outer() {
 }
 ```
 
-But it's a one way relationship, It doesn't work the other way around
+**But it's a one way relationship, It doesn't work the other way around**
 
 ```
 function outer() {
@@ -127,6 +127,25 @@ function outer() {
 
 outer() // hero is not defined
 ```
+
 The variable is successfully declared in inner, but i don't have access to it out here.
 
-So a variable declared in one function is available to nested functions within it
+So a variable declared in one function is available to nested functions within it.
+
+## 4. Function Expressions
+
+There's another syntax we can use to define functions:
+
+```
+const square = function (num) {
+  return num * num;
+}
+square(7); // 49
+```
+
+#### FUNCTIONS ARE... OBJECTS!
+In JavaScript functions are objects, which means we can put them in a variable, we can store 10 of them in an array, we can even pass them around as arguments, which is something we do all the time.
+
+**There are some differences between function expressions and normal functions how these behave**
+
+**You can add in a name for a function expression**