Salesforce JavaScript Developer Practice Exam

Which of the following statements about JavaScript modules is FALSE?

1. Modules always execute in strict mode, which means that variables need to be declared.

2. They only get executed once, right when they are loaded.

3. Import statements get hoisted, meaning all dependencies execute when the module is loaded.

4. Modules must include a constructor to be exported.

The correct answer is: Modules must include a constructor to be exported.

The statement that modules must include a constructor to be exported is false. JavaScript modules can export various types of entities, such as variables, functions, classes, and objects, without the necessity of having a constructor. In fact, a module is essentially a file that can export any type of value that can be imported by another module. This flexibility allows developers to structure their code more effectively by grouping related functionality without being constrained to exporting constructors. Other statements regarding JavaScript modules support essential features of the module system. For instance, modules do execute in strict mode, which enforces stricter parsing and error handling on your JavaScript code, making it safer and reducing runtime errors. Additionally, modules are executed only once when loaded, improving performance by avoiding re-execution of the same code. Lastly, the hoisting of import statements ensures that all imports are available to the module code before any of it runs, allowing developers to manage dependencies effectively. Understanding these principles further reinforces the idea that a constructor is not a requirement for module exports in JavaScript.