Explain the difference and use cases for functional components in Vue.js.

Instruction: Describe functional components in Vue.js and when to use them over standard components.

Context: This question aims to test the candidate's knowledge of functional components in Vue.js, including their benefits and appropriate scenarios for use, highlighting their understanding of Vue.js component optimization.

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In Vue 3, a functional component is a plain function that receives props and a context containing attributes, slots and emit. It has no normal stateful component instance/lifecycle of its own, but can render changing props and slot content; “functional” does not mean permanently static output.

This complete JavaScript module defines a small status display:...

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