The difference between computed and methods in vue

In Vue.js, computed is used to calculate response data and automatically updated; methods is used to execute executable code and needs to be called manually. computed depends on other response data and is automatically recalculated when dependencies change; methods are not affected by response data and must be called manually. computed uses the getter function and can only return calculated values; methods can contain any code. Prefer computed to improve performance and code clarity, and avoid performing complex operations in computed.

The difference between computed and methods in Vue.js

In Vue.js, computed and methods are used Different ways to define response data. The main difference between them is:

1. Computed property (computed)

• is a read-only property that is calculated based on other response data .
• The computed property is automatically recalculated when dependencies change.
• Use the getter function definition, which returns the calculated value.

2. Methods

• are functions containing executable code.
• When called, a method executes its code.
• is not suitable for automatically updating data and needs to be called manually.

Detailed comparison

Features	computed	methods
Purpose	Calculate response data	Execute executable code
Dependencies	Depends on other response data	None
Trigger update	Automatically update when dependencies change	Required Manually call
Data type	The value returned by the getter function	can contain any code
Use Method	Use in template orthis.$computed.propertyNameAccess	Use in templatethis.$methods.methodName()Access
Performance	Recalculated when dependencies change, performance depends on the calculation logic	Executed when called, performance depends on the complexity of the method

Usage example

computed:

<code class="javascript">export default {
  computed: {
    fullName() {
      return this.firstName + ' ' + this.lastName;
    }
  }
};</code>

methods:

<code class="javascript">export default {
  methods: {
    greet() {
      console.log('Hello, ' + this.name);
    }
  }
};</code>

Choose which method to use

• Use computed: When you need a read-only property that is based on other response data is calculated and needs to be updated automatically.
• Use methods: When you need to execute executable code that does not depend on response data, or when you need to manually control data updates.

Notes

• Prefer using computed where possible as it allows for better performance and code clarity.
• Avoid performing complex or time-consuming operations in computed as it may cause performance issues.

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