Rename refactor

In the previous "Multiple Cursors" exercise, we renamed a variable using multiple cursors. This is a bad idea. It is highly likely that you 1) won't get all instances of the variable and 2) it doesn't take care of instances in other files.

VS Code includes a powerful refactoring capability called "Rename". It allows you to rename a variable, method, class, ect and all references will be updated. Even if they are in another file.

Update the app class name

Exercise

• Export the App class from "app.js"

• Create a new file called "main.js"

• Import the App class and initialize it.

• Rename the App class in "index.html" Application

Answer

• Export the App class from the "app.js" file.

• Create a new file called "main.js" in the "src" folder.

• In the "main.js" file, import the App class and initialize it.

import App from "./app";
let app = new App();

• Highlight the App class declaration in the "app.js" file

• Press F2

• Rename to Application

• Notice that the reference in "main.js" is also updated

Note that if you want to see all references in your project for a specific object, put your cursor on it and press Shift + F12.