Vue3 uses a combined API to implement logical multiplexing of code

introduction

In the Vue 3 ecosystem, Composition API (Composition API) introduces a new way to build components, making logical reuse simpler and more flexible. In traditional options APIs, logical multiplexing usually relies on mixins and higher-order components (HOCs), and both can some extent lead to code complexity and readability problems. The combined API makes logical reuse more clear and manageable through functions.

This article will use examples to show you how to use a combined API to implement logical reuse of code in Vue 3.

What is a combination API?

Combination API is a new feature introduced in Vue 3 that allows developers to organize code using JavaScript functions to bundle logic, thereby improving readability and reusability. The setup function allows developers to create reactive data using ref and reactive, calculate properties using computed, and reuse logic using combination functions.

Here is a simple combination API example that deepens our understanding of it:

<template>
  <div>
    <h1>{{ count }}</h1>
    <button @click="increment">Increment</button>
  </div>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const count = ref(0);
    const increment = () => {
      ++;
    };
    return { count, increment };
  }
};
</script>

The way to reuse logic

Combination APIs provide a more natural way to reuse logic, which we can achieve by defining combinatorial functions.

Create a combination function

Creating a combination function is the core of implementing logical reuse. A combinatorial function is a normal JavaScript function that encapsulates a set of related responsive states and behaviors. Here is a simple example:

// 
import { ref } from 'vue';

export function useCounter() {
  const count = ref(0);
  const increment = () => {
    ++;
  };
  const decrement = () => {
    --;
  };
  return { count, increment, decrement };
}

In the example above, we created a name calleduseCounterThe combination function, which implements a simple counter logic, including statecountAnd two methodsincrementanddecrement。

Use combination functions in components

Now we can use this combination function in the component to reuse the logic:

<template>
  <div>
    <h1>Counter 1: {{  }}</h1>
    <button @click="">Increment Counter 1</button>
    <h1>Counter 2: {{  }}</h1>
    <button @click="">Increment Counter 2</button>
  </div>
</template>

<script>
import { useCounter } from './useCounter';

export default {
  setup() {
    const counter1 = useCounter();
    const counter2 = useCounter();
    
    return { counter1, counter2 };
  }
};
</script>

In this example, we used useCounter twice in the same component, creating counter1 and counter2 respectively. They are both independent counters and do not affect each other. In this way, we implement logic reuse without significantly increasing code complexity.

Combine multiple combination functions

Sometimes, logical multiplexing may involve the combination of multiple combined functions. Here is a more complex case showing how to combine multiple logics:

<template>
  <div>
    <h1>Data: {{  }}</h1>
    <button @click="">Fetch Data</button>
    <h1>Counter: {{  }}</h1>
    <button @click="">Increment</button>
  </div>
</template>

<script>
import { useCounter } from './useCounter';
import { useFetch } from './useFetch';

export default {
  setup() {
    const counter = useCounter();
    const fetchData = useFetch('/data');

    return { counter, fetchData };
  }
};
</script>

In this example,useCounteranduseFetchFunctions are combined to build a component together. In this way, logical reuse is greatly improved, and the behavior of components becomes clear and easy to maintain.

in conclusion

Combined APIs introduce a powerful and flexible way to implement code logic reuse. Developers can encapsulate similar logic together by combining functions, thereby improving the readability and reusability of the code. With the popularity of Vue 3, combining a combination of APIs to build highly maintainable applications has become a recommended way of development.

Remember, good logic reuse is not only about reducing code duplication, but also about improving team collaboration efficiency and simplifying the process of testing and maintenance. In actual development, proper use of combinatorial functions will make your components clearer and easier to understand, thus making your code base healthier.

Hopefully, through the examples in this article, you can better understand how to use a combination API to implement logic reuse in Vue 3, thereby improving your coding capabilities in front-end development.

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