Instruction: Describe what Mixins are and how they can be used in Vue.js applications.
Context: This question assesses the candidate's knowledge on code reusability in Vue.js using Mixins, including their pros and cons.
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To begin with, Mixins in Vue.js are a flexible way to distribute reusable functionalities for Vue components. A Mixin object can contain any component options. When a component uses a Mixin, all options in the Mixin will be "mixed" into the component's own options.
Using Mixins effectively lets us embed and reuse functionality across multiple components without duplicating code. This practice significantly helps in keeping the code DRY (Don't Repeat Yourself) and makes our applications easier to maintain and scale. For instance, if we have a common functionality say, data fetching from an API, we can create a Mixin that handles this and mix it into all components that need that...