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'));

Task

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

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Everything was clear?

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Section 3. Chapter 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'));

Task

Swipe to show code editor

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

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 3. Chapter 27

Switch to desktop for real-world practiceContinue from where you are using one of the options below