How I am able to access this.state in React without the need for binding or arrow functions

Understanding the concept of arrow functions inheriting the parent context is crucial in React development. Consider this React component example:

import React, { Component } from 'react';
import { View, Text } from 'react-native';
import axios from 'axios';


class AlbumList extends Component {
    constructor(props) {
        super(props);
        this.state = {
            albums: [],

        };

        axios.get('https://rallycoding.herokuapp.com/api/music_albums')
            .then(response => {
                 this.setState({ albums: response.data });
            });
    }


    renderAlbums() {
        const { albums } = this.state;
        const array = albums.map(album => (
                <Text>{album.title}</Text>
            ));

        return array;
    }


    render() {
        return (
            <View>
                { this.renderAlbums() }
            </View>
        );
    }
}

export default AlbumList;

Surprisingly, the { this.renderAlbums() } function works flawlessly without the need to convert it into an arrow function or use bind. While conventional advice suggests using arrow functions for proper functioning of this, this case proves otherwise. This raises the question - why include arrow functions inside ES6 classes if they work fine without?

Answer №1

When utilizing arrow functions, the definition of "this" is determined by the block in which the function is declared. On the other hand, if you are using regular functions, "this" is determined by where the function is called from. In this particular scenario, the function is being called within the render method, so "this" still refers to an instance of the component. If you were to attempt calling such a function from an onClick event of a button, it would be unsuccessful in locating "setState" as "this" would essentially be dictated by the actual rendered button and not the React class.

Answer №2

Arrow functions simply take on this from the scope of their parent, while regular functions adopt this from where they are executed.

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