Beberapa alat penting untuk pengembang bintang rock
Halo, Habr. Sebagai bagian dari perekrutan untuk kursus " Pengembang React.js " , kami menyiapkan terjemahan materi.
Kami mengundang semua orang ke pelajaran demo terbuka "Webpack dan babel" . Dalam pelajaran ini, kita akan melihat chip JavaScript yang modern dan kuat - Webpack dan Babel. Kami akan menunjukkan kepada Anda cara membuat proyek React dari awal menggunakan Webpack. Bergabunglah dengan kami!
ReactJS memiliki kinerja tinggi secara default. Tetapi dari waktu ke waktu Anda memiliki kesempatan untuk membuatnya lebih baik. Dan komunitas React yang luar biasa telah menghasilkan beberapa perpustakaan yang fantastis untuk itu.
Hari ini kita akan membahas tentang tujuh pustaka yang dapat meningkatkan kualitas kode Anda sekaligus meningkatkan kinerja.
Ayo mulai.
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1. Pertanyaan React
, React Query, React.
. , . . , Redux.
React Query
. .
const useFetch = (url) => {
const [data, setData] = useState();
const [isLoading, setIsLoading] = useState(false);
const [error, setError] = useState(false);
useEffect(() => {
const fetchData = async () => {
setIsError(false);
setIsLoading(true);
try {
const result = await fetch(url);
setData(result.data);
} catch (error) {
setError(error);
}
setIsLoading(false);
};
fetchData();
}, [url]);
return {data , isLoading , isError}
}
() React Query
, React Query. , .
import { useQuery } from 'react-query'
const { isLoading, error, data } = useQuery('repoData', () =>
fetch(url).then(res =>res.json()
)
)
, .
. . .
2. React Hook Form
React Hook Form - , .
-.
(UI)
, , React Hook Form .
React Hook Form
.
function LoginForm() {
const [email, setEmail] = React.useState("");
const [password, setPassword] = React.useState("");
const handleSubmit = (e: React.FormEvent) => {
e.preventDefault();
console.log({email, password});
}
return (
<form onSubmit={handleSubmit}>
<input
type="email"
id="email"
value={email}
onChange={(e) => setEmail(e.target.value)}
/>
<input
type="password"
id="password"
value={password}
onChange={(e) => setPassword(e.target.value)}
/>
</form>
);
}
React Form
React Hook Form.
function LoginForm() {
const { register, handleSubmit } = useForm();
const onSubmit = data => console.log(data);
return (
<form onSubmit={handleSubmit(onSubmit)}>
<input {...register("email")} />
<input {...register("password")} />
<input type="submit" />
</form>
);
}
. .
. . .
3. React Window
React Window . , 1 000 . , 1000 .
. .
1 000
import React, {useEffect, useState} from 'react';
const names = [] // 1000 names
export const LongList = () => {
return <div>
{names.map(name => <div> Name is: {name} </div>)}
<div/>
}
1000 , 10-20 .
React Window
React Window.
import { FixedSizeList as List } from 'react-window';
const Row = ({ index, style }) => <div style={style}> Name is {names[index]}</div>
const LongList = () => (
<List
height={150}
itemCount={1000}
itemSize={35}
width={300}
>
{Row}
</List>
);
, . , , .
. . .
4. React LazyLoad
- , , . , , .
React LazyLoad - , . , .
LazyLoad
, .
import React from 'react';
const ImageList = () => {
return <div>
<img src ='image1.png' />
<img src ='image2.png' />
<img src ='image3.png' />
<img src ='image4.png' />
<img src ='image5.png' />
</div>
}
LazyLoad
LazyLoad.
import React from 'react';
import LazyLoad from 'react-lazyload';
const ImageList = () => {
return <div>
<LazyLoad> <img src ='image1.png' /> <LazyLoad>
<LazyLoad> <img src ='image2.png' /> <LazyLoad>
<LazyLoad> <img src ='image3.png' /> <LazyLoad>
<LazyLoad> <img src ='image4.png' /> <LazyLoad>
<LazyLoad> <img src ='image5.png' /> <LazyLoad>
</div>
}
. . .
5. (Why Did You Render)
React-. , .
, Why Did You Render, . , , .
.
import React, {useState} from 'react'
const WhyDidYouRenderDemo = () => {
console.log('render')
const [user , setUser] = useState({})
const updateUser = () => setUser({name: 'faisal'})
return <>
<div > User is : {user.name}</div>
<button onClick={updateUser}> Update </button>
</>
}
export default WhyDidYouRenderDemo
.
, , .
. . .
6. Reselect
Redux, . , Redux , - , , , - .
Reselect , , .
, Redux .
. , .
. .
.
import { createSelector } from 'reselect'
const shopItemsSelector = state => state.shop.items
const subtotalSelector = createSelector(
shopItemsSelector,
items => items.reduce((subtotal, item) => subtotal + item.value, 0)
)
const exampleState = {
shop: {
items: [
{ name: 'apple', value: 1.20 },
{ name: 'orange', value: 0.95 },
]
}
}
. . .
7. Deep Equal
Deep Equal - , . . JavaScript, , , , .
.
const user1 = {
name:'faisal'
}
const user2 ={
name:'faisal'
}
const normalEqual = user1 === user2 // false
( ), ( ) .
Deep Equal, 46 . , .
var equal = require('deep-equal');
const user1 = {
name:'faisal'
}
const user2 ={
name:'faisal'
}
const deepEqual = equal(user1 , user2); // true -> exactly what we wanted!
. . .
. , React.
, . !