Encapsulation with Private Class Fields

Snippet

Encapsulation with Private Class Fields

Using the '#' prefix before a property name makes it truly private to the class. It cannot be accessed or modified from outside the class instance, ensuring strict encapsulation.

snippet.js
javascript
class SecureVault {
  #secretCode;
 
  constructor(code) {
    this.#secretCode = code;
  }
 
  verify(input) {
    return this.#secretCode === input;
  }
}
 
const vault = new SecureVault('1234');
console.log(vault.verify('1234')); // true
// console.log(vault.#secretCode); // SyntaxError

nodejs

Breakdown

#secretCode;

Declares a private field that is inaccessible outside the class scope.

this.#secretCode = code;

Assigns a value to the private field within the constructor.

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Encapsulation with Private Class Fields

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