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Aprenda Symbols 1/3 | Data Types and Variables
Introduction to JavaScript

bookSymbols 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());
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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());
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Even when we pass equal arguments, the result is still different, for example:

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

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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.

Solução

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Seção 3. Capítulo 27
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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());
copy

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());
copy

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

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

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.

Solução

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Tudo estava claro?

Como podemos melhorá-lo?

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Completion rate improved to 2
Seção 3. Capítulo 27
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