“Symbole JavaScript” Kod odpowiedzi

Symbole JavaScript

Symbols are primatives for unique values in javascript

> Symbol(value) returns a unique symbol

> Symbol.for(value) returns a unique symbol, but two calls using the 
same key will return the same symbol, within the scope

They can be useful because they are hidden from most iteration functions.
For ex, if you want to add a value to an object that you got back from a
third-party api. This will make sure your value doesn't appear in iteration
functions, and also won't require changing how the api is set up
QuietHumility

Symbole JavaScript

let sym1 = Symbol()
let sym2 = Symbol('foo')
let sym3 = Symbol('foo')
Puzzled Peafowl

Symbole JavaScript


let sym2 = Symbol('foo')
let sym3 = Symbol('foo')
 
		 console.log(Symbol(sym2==sym3)); /*false, symbols are guaranteed to be unique*/
Javasper

Symbol JavaScript

// two symbols with the same description

const value1 = Symbol('hello');
const value2 = Symbol('hello');

console.log(value1 === value2); // false
SAMER SAEID

Symbol JavaScript

// two symbols with the same description

const value1 = Symbol('hello');
const value2 = Symbol('hello');
SAMER SAEID

Odpowiedzi podobne do “Symbole JavaScript”

Pytania podobne do “Symbole JavaScript”

Więcej pokrewnych odpowiedzi na “Symbole JavaScript” w JavaScript

Przeglądaj popularne odpowiedzi na kod według języka

Przeglądaj inne języki kodu

Shell/Bash
C#
C++
C
CSS
HTML
Java
JavaScript
Objective-C
PHP
Python
Sql
Swift
Ruby
TypeScript
Go
Kotlin
Assembly
R
VBA
Scala
Rust
Dart
Elixir
Clojure
Haskell
Matlab
Erlang
Cobol
Fortran
Scheme
Perl
Groovy
Lua
Julia
Delphi
Abap
Lisp
Prolog
Pascal
ActionScript
Basic
Solidity
PowerShell
GDScript
Excel