Зміст курсу

Introduction to JavaScript (staging)

1. Introduction

Writing our first code Output Using Variables 1/2 Output Using Variables 2/2

2. JavaScript syntax

JavaScript Syntax JavaScript Variables JavaScript Operators Identifiers in JavaScript Naming Identifiers Reserved keywords in JavaScript Naming Convention in JavaScript. Case Styles Variables Naming Convention Boolean Naming Convention Constant Naming Convention Function & Classes Naming Convention Multiline Strings Multiline Strings. Concatenating Commenting in JavaScript Commenting in JavaScript. Multi-line Comments

Symbols 1/3

The symbol is a primitive data type that is used to create a unique identifier. Symbols are unchallengeable and unique.

Creation of symbols

We use the global Symbol() function to create a new symbol. We will work briefly with the functions in the later section but you have to learn that to create a primitive symbol we will use Symbol().


              12
            
let s = Symbol('foo');
console.log(s.toString());

Note: Symbol variable should be converted to string if you want to use it as a string value. That can be done by using .toString() method.

A unique value is created every time the Symbol() function is called or used and these values are not equal to each other (they are unique).


              1
            
console.log(Symbol() === Symbol());

Even when we pass equal arguments, the result is still different, for example:


              1
            
console.log(Symbol('Berlin') == Symbol('Berlin'));

Завдання

You have to check that Symbol('Monaco') and Symbol('Istanbul') are equal or not and display the result on the console.

Завдання

You have to check that Symbol('Monaco') and Symbol('Istanbul') are equal or not and display the result on the console.

Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів

Все було зрозуміло?

Секція 3. Розділ 27

Symbols 1/3

The symbol is a primitive data type that is used to create a unique identifier. Symbols are unchallengeable and unique.

Creation of symbols


              12
            
let s = Symbol('foo');
console.log(s.toString());

Note: Symbol variable should be converted to string if you want to use it as a string value. That can be done by using .toString() method.

A unique value is created every time the Symbol() function is called or used and these values are not equal to each other (they are unique).


              1
            
console.log(Symbol() === Symbol());

Even when we pass equal arguments, the result is still different, for example:


              1
            
console.log(Symbol('Berlin') == Symbol('Berlin'));

Завдання

You have to check that Symbol('Monaco') and Symbol('Istanbul') are equal or not and display the result on the console.

Завдання

You have to check that Symbol('Monaco') and Symbol('Istanbul') are equal or not and display the result on the console.

Все було зрозуміло?

Секція 3. Розділ 27

Symbols 1/3

The symbol is a primitive data type that is used to create a unique identifier. Symbols are unchallengeable and unique.

Creation of symbols


              12
            
let s = Symbol('foo');
console.log(s.toString());

Note: Symbol variable should be converted to string if you want to use it as a string value. That can be done by using .toString() method.

A unique value is created every time the Symbol() function is called or used and these values are not equal to each other (they are unique).


              1
            
console.log(Symbol() === Symbol());

Even when we pass equal arguments, the result is still different, for example:


              1
            
console.log(Symbol('Berlin') == Symbol('Berlin'));

Завдання

You have to check that Symbol('Monaco') and Symbol('Istanbul') are equal or not and display the result on the console.

Завдання

You have to check that Symbol('Monaco') and Symbol('Istanbul') are equal or not and display the result on the console.

Все було зрозуміло?

The symbol is a primitive data type that is used to create a unique identifier. Symbols are unchallengeable and unique.

Creation of symbols


              12
            
let s = Symbol('foo');
console.log(s.toString());

Note: Symbol variable should be converted to string if you want to use it as a string value. That can be done by using .toString() method.

A unique value is created every time the Symbol() function is called or used and these values are not equal to each other (they are unique).


              1
            
console.log(Symbol() === Symbol());

Even when we pass equal arguments, the result is still different, for example:


              1
            
console.log(Symbol('Berlin') == Symbol('Berlin'));

Завдання

You have to check that Symbol('Monaco') and Symbol('Istanbul') are equal or not and display the result on the console.

Секція 3. Розділ 27