Private Class Fields and Methods

Snippet

Private Class Fields and Methods

Private class fields (starting with #) ensure that internal data and methods cannot be accessed or modified from outside the class instance, providing true encapsulation.

snippet.js
javascript
class SecureVault {
  #secretKey;
 
  constructor(key) {
    this.#secretKey = key;
  }
 
  #hashKey() {
    return `hash_${this.#secretKey}`;
  }
 
  getAccess() {
    return this.#hashKey();
  }
}
 
const vault = new SecureVault('12345');
console.log(vault.getAccess()); // Works
// console.log(vault.#secretKey); // SyntaxError

Breakdown

#secretKey;

Declares a private field that is inaccessible outside the class.

#hashKey() { ... }

Defines a private method that can only be called by other methods within the same class.

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Private Class Fields and Methods

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