Expressions

Rules

1. Can be anonymous.

2. Cannot be hoisted.

File Location

We will be working in the following file:

    javascript-library
        └── 0-PreWork
        └── 1-Fundamentals
            └── 1-Grammar-and-Types
            └── 2-ControlFlow-and-ErrorHandling
            └── 3-Loops
            └── 4-Functions
                02-expressions.js <----You will be working in this file.

Anonymous Functions

When we say that function expressions can be anonymous, you'll see below that the function does not have a name after the function keyword is used:

var sayHello = function(){
    console.log("Hello");
}

Naming a function expression

You can also put a name on a function expression:

var sayHowdy = function howdy(){
    console.log("Howdy");
}

//Printing the value
console.log(sayHowdy());

No Hoisting

Function expressions CAN NOT be hoisted in JavaScript. This means that the call can not come before the function is declared.

//The call - this would cause an error
fooFunction(); 

//The expression
var foo = function fooFunction() {
  console.log('foo');
}

Practice

Practice writing 3 different function expressions of your own choosing.