// Global scope

function sayHello () {
  // Local scope 1

  var greet = 'Hello!' // Scoped to local scope 1
  console.log('1: ', greet) // Accessible from local scope 1
}

function changeGreet () {
  // Local scope 2

  console.log('2: ', greet) // NOT Accessible from local scope 2
}

sayHello()
changeGreet()

// 1: Hello!
// ReferenceError: greet is not defined