🗒️Typescript-Symbol()
2023-5-3|2023-5-3
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In TypeScript,
symbol() is a function that creates a new symbol. Symbols are unique objects that cannot be compared with each other, even if they have the same value. This makes them useful for things like creating private variables or properties, or for creating unique identifiers for objects.Useages
- Symbols are unique objects that cannot be compared with each other, even if they have the same value.
- However, symbol.for would first go to find if there is already a symbol for this variable, if there is, it will use that symbol
Below is the definition of Symbol.for
/** * Returns a Symbol object from the global symbol registry matching the given key if found. * Otherwise, returns a new symbol with this key. * @param key key to search for. */ for(key: string): symbol;
How to read symbol properties
/** * Returns the string and symbol keys of the own properties of an object. The own properties of an object * are those that are defined directly on that object, and are not inherited from the object's prototype. * @param target Object that contains the own properties. */ function ownKeys(target: object): (string | symbol)[];