How to implement functional reuse with hooks in vue

There are two ways to implement function reuse in Vue: Custom Hook: 1. Create a JavaScript function starting with use; 2. Import and call Hook in the component. Composition API: 1. Use ref to create reactive values; 2. Use functions to combine reactive values ​​and functions; 3. Import and use the composition API in components.

How Hooks in Vue implements function reuse

Hooks is a powerful function introduced in Vue 3.0 Mechanism that allows us to reuse logic without modifying component definitions. It provides a concise and flexible method for functional reuse.

Using Custom Hooks

Custom Hooks are a common way to create reusable functionality. They are normal JavaScript functions, starting with the use prefix.

import { ref, watch } from 'vue'

export const useCounter = () => {
  const count = ref(0)

  watch(count, (newValue) => {
    console.log(`Count changed to: ${newValue}`)
  })

  return {
    count,
    increment: () => count.value++,
    decrement: () => count.value--,
  }
}

This custom Hook can then be used in any component:

<template>
  <div>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <p>Count: {{ count }}</p>
  </div>
</template>

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

export default {
  setup() {
    const { count, increment, decrement } = useCounter()
    return { count, increment, decrement }
  },
}
</script>

Leveraging the Compositional API

Vue 3.0 introduces the Compositional API , which provides a set of functions for creating and combining reactive values ​​and functions. This allows us to easily create reusable functionality.

For example, the following code creates a useInput Hook for managing form input:

import { ref } from 'vue'

export const useInput = (initialValue) => {
  const value = ref(initialValue)

  const updateValue = (newValue) => {
    value.value = newValue
  }

  return {
    value,
    updateValue,
  }
}

In a component, you can use this to create reusable input fields:

<template>
  <input v-model="input.value" @input="input.updateValue" />
</template>

<script>
import { useInput } from './useInput'

export default {
  setup() {
    const input = useInput('')
    return { input }
  },
}
</script>

Conclusion

Through custom Hooks and combined APIs, we can easily implement function reuse in Vue, thus making our code more modular , maintainability and reusability.

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