closure_quiz_annotated.js

// scope chain: { name: undefined }
var name = 'John'
// scope chain: { name: 'John' }

function greet (name) {
  // [[scope]]: { name: 'John' }
  
  // scope chain: { name: 'John', outerScope: { name: 'John' } }
  return (function () {
    // [[scope]]: { name: 'John', outerScope: { name: 'John' } }
    
    // scope chain: { name: 'John', outerScope: { name: 'Sam' } }
    console.log('Hello ' + name)
  })
}

var sayHello = greet(name)

name = 'Sam'
// scope chain: { name: 'Sam' }

sayHello() // 'Hello John'