How to set object property value in javascript

Preface

JavaScript is an object-oriented programming language. Like other object-oriented languages, the properties and methods of objects in JavaScript often play a crucial role. Setting object property values ​​is one of the basic concepts of JavaScript. This article will explain how to use JavaScript to set object property values.

What is an object?

In JavaScript, an object is a data structure with properties and methods. Objects can be used to represent physical objects, abstract concepts, or functions. The properties of an object can be basic types, such as strings, numbers, Boolean values, or composite types, such as arrays, objects, or even functions.

How to set object property values

JavaScript provides a variety of ways to set object property values. This article will explain several of them in detail.

1. Using dot notation

The dot notation is one of the most common ways to set object property values. It is a concise and intuitive method that helps programmers quickly access and modify the properties of an object.

Code example:

var person = {
     name: 'Lucy',
     age: 22,
     gender: 'Female'
};
person.name = 'Tom';
person.age = 28;

In the above code, use the period to modify the attribute value of the person object.

2. Using square brackets

Square brackets are another way to set the value of an object's property. Although not as intuitive as the period, it allows us to flexibly manipulate the properties of JavaScript objects when needed.

Code example:

var person = {
     name: 'Lucy',
     age: 22,
     gender: 'Female'
};
person['name'] = 'Tom';
person['age'] = 28;

In the above code, use square brackets to modify the attribute values ​​​​of the person object.

3. Using Object.defineProperty()

Object.defineProperty() is a more advanced way that allows us to set objects in a more customized way properties.

Code example:

var person = {};
Object.defineProperty(person, 'name', {
    writable: false,
    value: 'Lucy'
});

In the above code, use Object.defineProperty() to set the name property of the person object. Since the writable attribute is set to false, the value of the name attribute cannot be modified.

Summary

The above are several common ways to set object property values ​​in JavaScript. In the actual programming process, you need to choose a method that suits you according to your specific needs.

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