Salesforce JavaScript Developer Practice Exam

Data can be passed between Lightning Web Components by using properties marked with @api and through custom events. The @api decorator allows a component to expose a public property, which means that it can be set from a parent component. This is an essential feature of Lightning Web Components (LWC) for enabling communication where a parent can pass data down to child components seamlessly.

In addition, using custom events allows a child component to communicate with its parent by dispatching an event that the parent can listen for. This is a fundamental way for components within LWC to interact, adhering to a unidirectional data flow that promotes better architecture and maintainability.

The option mentioning global variables is not viable within the context of LWC, as it goes against the principles of encapsulation and reusability. Importing data directly from Salesforce does not pertain specifically to the communication between components but rather to data retrieval mechanisms in LWC. Direct DOM manipulation is also discouraged in LWC since it bypasses the framework's rendering process and can lead to inconsistencies between the DOM and the data model.