Combined API functions in Vue3: a new way of writing components

Combined API functions in Vue3: a new way of writing components

Vue is a popular JavaScript framework that has made a mark in the field of web development with its intuitive development experience, efficient performance and elegant API design. gradually occupied an important position. Recently, Vue has updated its latest version, Vue3, and one of the most eye-catching features is the combined API function, which brings developers a new way of writing components.

What is a combined API function?

In Vue2, developers mainly write components through the options API, which describes the component's data, methods, life cycle, etc. in the form of configuration objects. As applications continue to expand and details continue to improve, the amount of code in components gradually increases. When components become complex, the scalability and maintainability of the option API also become limited, which often results in poor code readability. Problems such as error-prone and difficult to reuse.

In Vue3, the combined API function provides a new way of writing components. Composite API functions no longer describe components through configuration objects, but consist of a set of reusable functions that receive and manage different aspects of the component, such as state, life cycle, computed properties, etc. Combined API functions can decompose component logic into independent function blocks, making it easy to reuse, test and maintain.

Advantages of combined API functions

1. Better readability

The combined API functions are based on specific functional modules and implement the component logic Modular division reduces code complexity and deep nesting. This allows developers to more intuitively understand the logic of each part of the component, enhancing the readability and maintainability of the code.

2. Better type inference

Vue3 uses TypeScript as the main language, and the combined API functions have better type inference under TypeScript. Developers can better understand a function's input and output types and perform safer type checking. This results in code that has fewer type errors and is more stable and reliable when compiled and developed.

3. Fewer side effects

Vue2 components created using the options API can easily cause side effects. The combined API function isolates component side effects such as state and methods, better manages the component's state and methods, and can operate component side effects more safely.

4. Better component reuse and testing

Combined API functions encapsulate component logic into reusable functions, making component code easier to reuse. Developers can encapsulate the same logic into fixed functions for reuse across multiple components, which can reduce code rewriting and increase code reuse. At the same time, due to the independence of functions, unit testing can be performed more conveniently, effectively ensuring the quality and stability of components.

How to use combined API functions?

Using the combined API function in Vue3 requires calling the setup function. The setup function is the entry point of a component. It is executed before the component is created to create the component's state, methods, etc. The setup function needs to return an object that contains all the state, methods, etc. of the component.

For example, we write a counter component:

<template>
  <div>
    <button @click="count++">增加</button>
    <span>{{ count }}</span>
  </div>
</template>

<script>
import { ref } from 'vue'

export default {
  setup() {
    const count = ref(0)

    return {
      count
    }
  }
}
</script>

In the above code, we use ref to declare the status of the counter count and return it to the setup function. Next, we can use count in the template.

Summary

Combined API functions are an important feature in Vue3 and a brand new way of writing components. It is based on functions and modularizes the code of components, making the code easier to read, maintain and test. Using combined API functions, you can better manage the state and methods of components, better separate the side effects of components, and make components more robust and reliable.

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