How to choose between class methods and properties in react?

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Consider the following code in react + ES6:

import React, { Component } from 'react';

const myFunction=(x,y)=>{
   return x*y
   };

 class MyTest extends Component {
 // state comes here 
   myProperty=(x,y)=>{
      return x*y
   };

   myMethod(x,y){
    return x*y
   }

    render () {
      return (<div>
          <h2>Result of myMethod: {this.myMethod(2,3)}</h2>
          <h2>Result of myProperty: {this.myProperty(2,3)}</h2>
          <h2>Result of myFunction: {myFunction(2,3)}</h2>
        </div>
      );
  }
 }
  export default MyTest;

Here's what the output looks like:

  • Result of myMethod: 6

  • Result of myProperty: 6

  • Result of myFunction: 6

Is there really a difference? Is one preferable to another?


Considering the example that you shown, there is no big difference and they probably can be used interchangeable.

There are just a very little things like the fact that having an function expression declared outside, probably, internally, it won't get reacreated every time a class is instantiated. I honestly have to check the EcmaScript spec to verify it.

Things changes when you need to pass one of these functions as a reference to other functions and whether these destinations needs to access the original context or a new one.

Lambdas can't have other context than the one they're declared in, so they can be passed as references without troubles.

Instance methods, instead, needs to be bound to a context before they gets passed as references.

Have you ever seen this pattern?

constructor() {
  // ...
  this.myMethod = this.myMethod.bind(this)
}

myMethod(x,y){
  return x*y
}

This just overwrite myMethod in the class scope with a copy of the same method bound with this context. Basically, exactly the same as:

myMethod = (x, y) => x * y

Use class properties to clean up your classes and React components, Forget to declare propTypes or defaultProps in your React component? But the use of static methods can be useful for things such as utility functions or references. Aside from being able to declare static properties on classes, there's another Flutter Or React Native: Which is the Best Choice for 2020? Properties look like data and the developers that use your class will expect those properties to behave like data. This column will explore those expectations, and show you how to best determine when you should implement functionality as a property or as a method.The most obvious expectation is that users will believe the observable state for


In your case I would recommend you to go with functional component i.e., the function which you have declared outside class is the right one to go in your case. Because you are passing in input and expecting output and there is no state management inside that function. So it’s good to go with functional component.

Regarding using arrow function or normal function, check below thread for detailed answer

React: Which is recommended arrow or normal function?

React JS — Understanding Functional & Class Components, Likewise we create a LEGO structure from many little LEGO blocks, we React has 2 types of components: Functional (Stateless) and Class (Stateful). for properties) object argument with data and returns a React element. Choose the Best JavaScript Framework for Your Server-Side Development. This class method reads from this.props.user. Props are immutable in React so they can never change. However, this is, and has always been, mutable. Indeed, that’s the whole purpose of this in a class. React itself mutates it over time so that you can read the fresh version in the render and lifecycle methods.


How to write a React component without using classes or hooks, In the case of the class component, React creates an instance of the class using JavaScript allows inheritance of properties and methods between have above, the linked object can be anything you choose, if you use the� How To Manage State on React Class Components. In React, state refers to a structure that keeps track of how data changes over time in your application. Managing state is a crucial skill in React because it allows you to make interactive web applications. In this tutorial, you'll run through an example of managing state on class-based components.


Storing data in state vs. class variable, After picking up a few syntax cues, he started writing class components in The constructor from one of his components looked like this: Later on, when he wanted to update the value stored on the object, he did with a I see that you're using class variables to store information on your React component. Create a Class Component. When creating a React component, the component's name must start with an upper case letter. The component has to include the extends React.Component statement, this statement creates an inheritance to React.Component, and gives your component access to React.Component's functions.


Choosing the Best Approach for React Event Handlers, But passing an object's method as an event handler runs into A proposed ECMAScript syntax for class properties provides a way to get Arrow functions preserve the value of this from the context where they are defined. Between Siblings : (i) Combine above two methods (ii) Using Redux (iii) Using React’s Context API This blog majorly contains a compilation of the implementation of these concepts, which would surely be beneficial for any beginner trying to grasp things at a glance.


React.Component – React, The render() method is the only required method in a class component. If you are confident you want to write it by hand, you may compare this.props with property in getSnapshotBeforeUpdate because there may be delays between� Binding methods helps ensure that the second snippet works the same way as the first one. With React, typically you only need to bind the methods you pass to other components. For example, <button onClick={this.handleClick}> passes this.handleClick so you want to bind it.