06_object.js

const person = {
  name: 'Vladilen',
  age: 26,
  isProgrammer: true,
  languages: ['ru', 'en', 'de'],
  // 'complex key': 'Complex Value',
  // ['key_' + (1 + 3)]: 'Computed Key', // key_4
  greet() {
    console.log('greet from person')
  },
  info() {
    // console.log('this:', this)
    console.info('Информация про человека по имени:', this.name)
  }
}

// console.log(person.name)
// const ageKey = 'age'
// console.log(person[ageKey])
// console.log(person['complex key'])
// person.greet()
//
// person.age++
// person.languages.push('by')
// // person['key_4'] = undefined
// delete person['key_4']
//
// console.log(person)
// console.log(person['key_4'])

// const name = person.name
// const age = person.age
// const languages = person.languages

// const {name, age: personAge = 10, languages} = person
// console.log(person)

// for (let key in person) {
//   if (person.hasOwnProperty(key)) {
//     console.log('key:', key)
//     console.log('value:', person[key])
//   }
// }
// Object.keys(person).forEach((key) => {
//   console.log('key:', key)
//   console.log('value:', person[key])
// })

// Context
// person.info()

const logger = {
  keys() {
    console.log('Object Keys: ', Object.keys(this))
  },

  keysAndValues() {
    // "key": value
    // Object.keys(this).forEach(key => {
    //   console.log(`"${key}": ${this[key]}`)
    // })
    // const self = this
    Object.keys(this).forEach(function(key) {
      console.log(`"${key}": ${this[key]}`)
    }.bind(this))
  },

  withParams(top = false, between = false, bottom = false) {
    if (top) {
      console.log('------- Start -------')
    }
    Object.keys(this).forEach((key, index, array) => {
      console.log(`"${key}": ${this[key]}`)
      if (between && index !== array.length - 1) {
        console.log('--------------')
      }
    })

    if (bottom) {
      console.log('------- End -------')
    }
  }
}

// const bound = logger.keys.bind(person)
// bound()
// logger.keysAndValues.call(person)
logger.withParams.call(person, true, true, true)
logger.withParams.apply(person, [true, true, true])