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Vue 3.0 Style Guide

Vue 3.0 instance methods

In Vue 3.0, instance methods are created in the methods object inside a component's definition. These methods can be used in the component's template as well as in the component's script.

Here's a tutorial on how to create and use instance methods in Vue 3.0:

Step 1: Initialize your Vue project.

Create a new Vue 3 project using Vue CLI:

vue create my-project

Choose Vue 3 when asked which version of Vue to use.

Step 2: Open your App.vue file, or any component you'd like to use instance methods in, and add the methods object.

Here's an example:

<template>
  <div class="app">
    <button @click="sayHello">Click me</button>
  </div>
</template>

<script>
export default {
  methods: {
    sayHello() {
      console.log('Hello, Vue 3!');
    }
  }
}
</script>

In this example, a sayHello method is created in the methods object. This method logs the message "Hello, Vue 3!" to the console. In the template, this method is attached to a button's click event using v-on:click or the shorthand @click. When the button is clicked, the sayHello method will be called.

Step 3: Run your application.

You can run your Vue 3 application with the following command:

npm run serve

Now when you click the button, you should see "Hello, Vue 3!" logged in your browser's console.

This is a basic usage of instance methods in Vue 3.0. They provide a way to encapsulate code that can be reused throughout a component's template and script. You can also pass parameters to these methods, and use the this keyword inside them to access the component's data, computed properties, other methods, etc.

Defining Instance Methods in Vue 3.0:

Description: Define methods in the methods option of a Vue component to encapsulate functionality.

Code Example:

<!-- MyComponent.vue -->
<template>
  <button @click="sayHello">Click me</button>
</template>

<script>
export default {
  methods: {
    sayHello() {
      console.log('Hello from Vue component');
    },
  },
};
</script>

Vue 3.0 Lifecycle Hooks as Instance Methods:
- Description: Lifecycle hooks are special instance methods invoked at specific stages of a component's lifecycle.
- Code Example:
```

<script>
export default {
  created() {
    console.log('Component created');
  },
};
</script>
```

Vue 3.0 Instance Methods vs Computed Properties:

Description: Use instance methods for methods, while computed properties are ideal for reactive values.

Code Example:

<!-- MyComponent.vue -->
<template>
  <p>{{ calculateSum() }}</p>
</template>

<script>
export default {
  data() {
    return {
      numbers: [1, 2, 3],
    };
  },
  methods: {
    calculateSum() {
      return this.numbers.reduce((acc, num) => acc + num, 0);
    },
  },
};
</script>

Vue 3.0 Custom Instance Methods:

Description: Create custom methods tailored to your component's needs.

Code Example:

<!-- MyComponent.vue -->
<template>
  <button @click="customMethod">Click me</button>
</template>

<script>
export default {
  methods: {
    customMethod() {
      console.log('Custom method invoked');
    },
  },
};
</script>

Accessing Data Within Instance Methods in Vue 3.0:

Description: Access component data within instance methods using this.

Code Example:

<!-- MyComponent.vue -->
<template>
  <button @click="updateCount">Click me</button>
</template>

<script>
export default {
  data() {
    return {
      count: 0,
    };
  },
  methods: {
    updateCount() {
      this.count += 1;
    },
  },
};
</script>

Vue 3.0 Instance Methods and Asynchronous Operations:

Description: Instance methods can handle asynchronous operations, such as promises or async/await.

Code Example:

<!-- MyComponent.vue -->
<template>
  <button @click="fetchData">Fetch Data</button>
</template>

<script>
export default {
  methods: {
    async fetchData() {
      const response = await fetch('https://api.example.com/data');
      const data = await response.json();
      console.log(data);
    },
  },
};
</script>