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'));

Oppgave

Swipe to start coding

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

Løsning

Bytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor

Alt var klart?

Takk for tilbakemeldingene dine!

Seksjon 3. Kapittel 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'));

Oppgave

Swipe to start coding

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

Løsning

Bytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor

Alt var klart?

Takk for tilbakemeldingene dine!

Seksjon 3. Kapittel 27

Bytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor