What is Symbol

What is Symbol in React.Js and React Native?

Symbols in React.Js and React Native are a unique and immutable data type that is used to create unique identifiers. They are often used as keys in objects or maps to ensure that each key is unique. Symbols are created using the `Symbol()` function, which returns a new symbol each time it is called.

Symbols are often used to create private properties or methods in classes, as they cannot be accessed from outside the class. This makes symbols a powerful tool for encapsulation and data hiding in React.Js and React Native applications.

Symbols can also be used to create well-known symbols, which are predefined symbols that have special meaning in JavaScript. Some examples of well-known symbols include `Symbol.iterator`, `Symbol.toStringTag`, and `Symbol.hasInstance`.

Symbols are unique in that they do not have a literal representation like strings or numbers. This means that symbols cannot be converted to a string or number using methods like `toString()` or `valueOf()`. Instead, symbols are represented by their own unique symbol value.

Symbols are also used to create symbol properties, which are properties that are keyed by symbols rather than strings. This allows developers to create properties that are not enumerable or writable, making them ideal for creating private or internal properties in objects.

Symbols are a powerful and versatile feature of JavaScript that can be used in a variety of ways in React.Js and React Native applications. By understanding how symbols work and how to use them effectively, developers can take advantage of the unique capabilities that symbols offer.