JavaScript set()

Posted 2023-05-17 19:24:16

11K

In JavaScript, a setter can be used to execute a function whenever a specified property is attempted to be changed. Setters are most often used in conjunction with getters to create a type of pseudo-property. It is not possible to simultaneously have a setter on a property that holds an actual value.

Examples

Defining a setter on new objects in object initializers

The following example define a pseudo-property current of object language. When current is assigned a value, it updates log with that value:

const language = {
  set current(name) {
    this.log.push(name);
  },
  log: [],
};

language.current = "EN";
console.log(language.log); // ['EN']

language.current = "FA";
console.log(language.log); // ['EN', 'FA']

Note that current is not defined, and any attempts to access it will result in undefined.

Effettua l'accesso per mettere mi piace, condividere e commentare!

Жизненные вопросы

Поймать последнюю волну. Caught by a Wave. (2021)

Невероятно драматическая история любви, которая в свою очередь поведает о двух подростках,...

By 2022-09-17 09:21:53 0 33K

Pre-School

The Importance of Preschool: Laying the Foundation for Lifelong Learning

Preschool is often seen as the first formal experience for young children before they enter...

By 2024-11-27 17:49:03 0 13K

Personal Finance

How Long Does It Take to Pay Off Student Loans?

How Long Does It Take to Pay Off Student Loans? How Repayment Plan, Loan Amount, and Income...

By 2025-12-19 23:08:51 0 2K

Business

How to Give Feedback Effectively – Frameworks, Real-World Examples, and Best Practices

Giving feedback is a powerful skill—whether you're a manager, colleague, teacher, or peer....

By 2025-07-30 11:32:58 0 6K

Business

How Can I Get My First Customers?

Getting your first customers is one of the biggest challenges when starting a business. Without a...

By 2025-03-14 16:16:11 0 13K