How to change JavaScript constant objects and constant arrays

This article mainly introduces the "JavaScript constant objects and constant array how to change" related knowledge, editor through the actual case to show you the operation process, the method of operation is simple and fast, practical, I hope that this "JavaScript constant objects and constant array how to change" article can help you solve the problem.

Constant objects can be changed

You can change the properties of a constant object:

Example

/ / you can create const objects:

Const car = {type: "porsche", model: "911", color: "Black"}

/ / you can change the properties:

Car.color = "White"

/ / you can add attributes:

Car.owner = "Bill"

However, you cannot reassign a constant object:

Example

Const car = {type: "porsche", model: "911", color: "Black"}

Car = {type: "Volvo", model: "XC60", color: "White"}; / / ERROR

Constant array can be changed

You can change the elements of a constant array:

Example

/ / you can create a constant array:

Const cars = ["Audi", "BMW", "porsche"]

/ / you can change the element:

Cars [0] = "Honda"

/ / you can add elements:

Cars.push ("Volvo")

However, you cannot reassign a constant array:

Example

Const cars = ["Audi", "BMW", "porsche"]

Cars = ["Honda", "Toyota", "Volvo"]; / / ERROR

This is the end of the introduction to "how to change JavaScript constant objects and constant arrays". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.