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205 lines (176 loc) · 4.74 KB
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//scope.js
function letsLearnScope() {
var gravity = 9.81
console.log(gravity)
}
// console.log(gravity), Uncaught ReferenceError: gravity is not defined
if (true){
var gravity = 9.81
console.log(gravity) // 9.81
}
console.log(gravity) // 9.81
for(var i = 0; i < 3; i++){
console.log(i) // 0, 1, 2
}
console.log(i) // 3
//scope.js
function letsLearnScope() {
var gravity = 9.81
console.log(gravity)
}
// console.log(gravity), Uncaught ReferenceError: gravity is not defined
if (true){
var gravity = 9.81
console.log(gravity) // 9.81
}
console.log(gravity) // 9.81
for(var i = 0; i < 3; i++){
console.log(i) // 0, 1, 2
}
console.log(i) // 3
//scope.js
function letsLearnScope() {
// you can use let or const, but gravity is constant I prefer to use const
const gravity = 9.81
console.log(gravity)
}
// console.log(gravity), Uncaught ReferenceError: gravity is not defined
if (true){
const gravity = 9.81
console.log(gravity) // 9.81
}
// console.log(gravity), Uncaught ReferenceError: gravity is not defined
for(let i = 0; i < 3; i++){
console.log(i) // 0, 1, 2
}
// console.log(i), Uncaught ReferenceError: i is not defined
const rectangle = {
length: 20,
width: 20
}
console.log(rectangle) // {length: 20, width: 20}
const person = {
firstName: 'Asabeneh',
lastName: 'Yetayeh',
age: 250,
country: 'Finland',
city: 'Helsinki',
skills: [
'HTML',
'CSS',
'JavaScript',
'React',
'Node',
'MongoDB',
'Python',
'D3.js'
],
getFullName: function() {
return `${this.firstName}${this.lastName}`
},
'phone number': '+3584545454545'
}
// accessing values using .
console.log(person.firstName)
console.log(person.lastName)
console.log(person.age)
console.log(person.location) // undefined
// value can be accessed using square bracket and key name
console.log(person['firstName'])
console.log(person['lastName'])
console.log(person['age'])
console.log(person['age'])
console.log(person['location']) // undefined
// for instance to access the phone number we only use the square bracket method
console.log(person['phone number'])
const person = {
firstName: 'Asabeneh',
lastName: 'Yetayeh',
age: 250,
country: 'Finland',
city: 'Helsinki',
skills: [
'HTML',
'CSS',
'JavaScript',
'React',
'Node',
'MongoDB',
'Python',
'D3.js'
],
getFullName: function() {
return `${this.firstName} ${this.lastName}`
}
}
console.log(person.getFullName())
// Asabeneh Yetayeh
// Changing method
const person = {
firstName: 'Asabeneh',
lastName: 'Yetayeh',
age: 250,
country: 'Finland',
city: 'Helsinki',
skills: [
'HTML',
'CSS',
'JavaScript',
'React',
'Node',
'MongoDB',
'Python',
'D3.js'
],
getFullName: function() {
return `${this.firstName} ${this.lastName}`
}
}
person.nationality = 'Ethiopian'
person.country = 'Finland'
person.title = 'teacher'
person.skills.push('Meteor')
person.skills.push('SasS')
person.isMarried = true
person.getPersonInfo = function() {
let skillsWithoutLastSkill = this.skills
.splice(0, this.skills.length - 1)
.join(', ')
let lastSkill = this.skills.splice(this.skills.length - 1)[0]
let skills = `${skillsWithoutLastSkill}, and ${lastSkill}`
let fullName = this.getFullName()
let statement = `${fullName} is a ${this.title}.\nHe lives in ${this.country}.\nHe teaches ${skills}.`
return statement
}
console.log(person)
console.log(person.getPersonInfo())
const person = {
firstName: 'Asabeneh',
age: 250,
country: 'Finland',
city:'Helsinki',
skills: ['HTML', 'CSS', 'JS'],
title: 'teacher',
address: {
street: 'Heitamienkatu 16',
pobox: 2002,
city: 'Helsinki'
},
getPersonInfo: function() {
return `I am ${this.firstName} and I live in ${this.city}, ${this.country}. I am ${this.age}.`
}
}
//Object methods: Object.assign, Object.keys, Object.values, Object.entries
//hasOwnProperty
const copyPerson = Object.assign({}, person)
console.log(copyPerson)
const keys = Object.keys(copyPerson)
console.log(keys) //['firstName', 'age', 'country','city', 'skills','title', 'address', 'getPersonInfo']
const address = Object.keys(copyPerson.address)
console.log(address) //['street', 'pobox', 'city']
const values = Object.values(copyPerson)
console.log(values)
const entries = Object.entries(copyPerson)
console.log(entries)
console.log(copyPerson.hasOwnProperty('name'))
console.log(copyPerson.hasOwnProperty('score'))