The goit-react-hw-03-image-finder from gosiaantoniak

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State mutation

goit-react-hw-03-image-finder/src/components/App.js

Lines 42 to 44 in 5f08dd2

    
           let { actualPage } = this.state; 
        
           actualPage++; 
        
           this.setState({ actualPage: actualPage });

Tutaj mutujesz stan, lepie byłoby zrobić coś w stylu:

this.setState(state => ({ actualPage: state.actualPage + 1}));
https://reactjs.org/docs/optimizing-performance.html#the-power-of-not-mutating-data
https://beta.reactjs.org/learn/updating-objects-in-state#why-is-mutating-state-not-recommended-in-react

Suggestion

goit-react-hw-03-image-finder/src/components/App.js

Lines 74 to 109 in 5f08dd2

    
           async componentDidUpdate(prevProps, prevState) { 
        
             if (prevState.query !== this.state.query) { 
        
               const { query } = this.state; 
        
               this.setState({ isLoading: true }); 
        
               try { 
        
                 const fetchedData = await api.fetchImageWithQuery(query, 1); 
        
                 const mapedImages = this.mapNewImages(fetchedData.images); 
        
                 const lastPage = Math.ceil(fetchedData.total / 12); 
        
                 this.setState({ images: mapedImages, actualPage: 1, lastPage: lastPage }); 
        
                 window.scrollTo({ top: 0, behavior: 'smooth' }); 
        
               } catch (error) { 
        
                 this.setState({ error }); 
        
               } finally { 
        
                 this.setState({ isLoading: false }); 
        
               } 
        
             } 
        
             if ( 
        
               prevState.actualPage !== this.state.actualPage && 
        
               prevState.query === this.state.query && 
        
               this.state.actualPage !== 1 
        
             ) { 
        
               const { query, actualPage, images } = this.state; 
        
               this.setState({ isLoading: true }); 
        
               try { 
        
                 const fetchedData = await api.fetchImageWithQuery(query, actualPage); 
        
                 const mapedImages = await this.mapNewImages(fetchedData.images); 
        
                 const concatImages = images.concat(mapedImages); 
        
                 this.setState({ images: concatImages }); 
        
               } catch (error) { 
        
                 this.setState({ error }); 
        
               } finally { 
        
                 this.setState({ isLoading: false }); 
        
               } 
        
             } 
        
           }

Tą część odpowiedzialną za fetchowanie można by wydzielić do wspólnej funkcji i używać zarówno na load more images i search.

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	let { actualPage } = this.state;
	actualPage++;
	this.setState({ actualPage: actualPage });

	async componentDidUpdate(prevProps, prevState) {
	if (prevState.query !== this.state.query) {
	const { query } = this.state;
	this.setState({ isLoading: true });
	try {
	const fetchedData = await api.fetchImageWithQuery(query, 1);
	const mapedImages = this.mapNewImages(fetchedData.images);
	const lastPage = Math.ceil(fetchedData.total / 12);
	this.setState({ images: mapedImages, actualPage: 1, lastPage: lastPage });
	window.scrollTo({ top: 0, behavior: 'smooth' });
	} catch (error) {
	this.setState({ error });
	} finally {
	this.setState({ isLoading: false });
	}
	}

	if (
	prevState.actualPage !== this.state.actualPage &&
	prevState.query === this.state.query &&
	this.state.actualPage !== 1
	) {
	const { query, actualPage, images } = this.state;
	this.setState({ isLoading: true });
	try {
	const fetchedData = await api.fetchImageWithQuery(query, actualPage);
	const mapedImages = await this.mapNewImages(fetchedData.images);
	const concatImages = images.concat(mapedImages);
	this.setState({ images: concatImages });
	} catch (error) {
	this.setState({ error });
	} finally {
	this.setState({ isLoading: false });
	}
	}
	}

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