Functions can be declared in 2 different ways.

• Function declarations are hoisted.
  • Hoisted means that it is "pulled up" to the top of the current scope.
  • This means you can call it before it's declared.

sayHello('Kevin') // this works!

function sayHello(name) {
    console.log('Hello, ' + name)
}

• Function expressions are functions which are assigned to a variable.
• They are NOT hoisted.
  • This means you can not call it before it is declared.

sayHello('Kevin') // this will throw an error!

var sayHello = function (name) {
    console.log('Hello' + name)
}