console.clear()

testValue()

testSpaces()

testFunctionReplacer()

testArrayReplacer()

testSymbolKeyedValues()

testNonEnumerableValue()

testToJSON()

console.log('Tests passed')

// function declarations

function testValue() {

  var input = {

    name: 'Kent C. Dodds',

    username: 'kentcdodds',

  }

  var expected = '{"name":"Kent C. Dodds","username":"kentcdodds"}'

  var result = JSON.stringify(input)

  expect(result).toEqual(expected)

}

function testSpaces() {

  var input = {

    name: {

      first: 'Kent',

      middle: 'Christopher',

      last: 'Dodds'

    },

    username: 'kentcdodds',

  }

  var expected = `{

  "name": {

    "first": "Kent",

    "middle": "Christopher",

    "last": "Dodds"

  },

  "username": "kentcdodds"

}`

  var result = JSON.stringify(input, null, 2)

  expect(result).toEqual(expected)

}

function testFunctionReplacer() {

  var input = {

    title: 'Gone with the Wind',

    publishDate: new Date('1936-06-10'),

    movieReleaseDate: new Date('1940-01-17'),

  }

  var expected = '{"title":"Gone with the Wind","publishDate":"1936-06-10","movieReleaseDate":"1940-01-17"}'

  var result = JSON.stringify(input, replacer)

  expect(result).toEqual(expected)

  function replacer(key, value) {

    // `this` is bound to the object in which the value was found

    if (this[key] instanceof Date) {

      return value.substring(0, 10)

    }

    return value

  }

}

function testArrayReplacer() {

  var input = [

    {id: 3, title: 'Inside Out', rating: 98, genres: ['Animation', 'Kids & Family']},

    {id: 6, title: 'The Hunger Games', rating: 84, genres: ['    Drama', 'Mystery & Suspense', 'Science Fiction & Fantasy']},

    {id: 13, title: 'Catch Me If You Can', rating: 96, genres: ['Drama', 'Action & Adventure']},

  ]

  var expected = '[{"id":3,"title":"Inside Out"},{"id":6,"title":"The Hunger Games"},{"id":13,"title":"Catch Me If You Can"}]'

  var result = JSON.stringify(input, ['id', 'title'])

  expect(result).toEqual(expected)

}

function testSymbolKeyedValues() {

  var input = {foo: 'foo'}

  var barSymbol = Symbol('bar')

  input[barSymbol] = 'bar'

  var expected = '{"foo":"foo"}'

  var result = JSON.stringify(input)

  expect(result).toEqual(expected)

}

function testNonEnumerableValue() {

  var input = Object.create(null, {

    theAnswer: {

      value: 42,

      enumerable: true

    },

    theQuestion: {

      value: 'Who knows...',

      enumerable: false

    }

  })

  var expected = '{"theAnswer":42}'

  var result = JSON.stringify(input)

  expect(result).toEqual(expected)

}

function testToJSON() {

  var input = {

    name: {

      first: 'Dave',

      middle: 'James',

      last: 'Smith',

      toJSON: function(key) {

        return {awesomeName: `The Awesome ${this.first} ${this.middle} ${this.last}`}

        console.log(key, this)

      },

    },

    username: 'djsmith42',

  }

  var expected = '{"name":{"awesomeName":"The Awesome Dave James Smith"},"username":"djsmith42"}'

  var result = JSON.stringify(input)

  expect(result).toEqual(expected)

}