The difference between calculated properties and methods in vue

In Vue.js, computed properties are used to calculate derived data, while methods are used to perform operations. Computed properties are the values ​​of expressions, which are recalculated whenever the dependent data changes; methods are functions, which are only executed when called.

The difference between computed properties and methods in Vue

In Vue.js, computed properties and methods are processing Two mechanisms for data, but they have different uses and properties.

Computed properties

• Purpose: Computed properties are used to calculate derived data or derive new values ​​from other data. It is an expression that calculates a new value based on other reactive data.

• Features:

  • Use {{ }} syntax to access in templates.
  • As long as the dependent data changes, it will be recalculated.
  • Cache calculation results to improve performance.

methods

• Usage: methods are used to perform operations, change data, or initiate asynchronous ask. It is a JavaScript function that can be called by component instances.

• Features:

  • Use v-on event handler calls in templates.
  • Only executed when explicitly called.
  • Do not cache the results, they will be re-executed each time they are called.

#When to use computed properties?

• When new values ​​need to be calculated based on other data.
• When it is necessary to cache calculation results to improve performance.
• When the calculation logic is relatively simple and no custom functions are required.

When to use methods?

• When you need to perform operations, change data, or initiate asynchronous requests.
• When custom functionality or complex logic is required.
• When there is no need to cache calculation results.

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