need help explaining each and every line of the code functionality ========================================================== import React, { useEffect, useContext, useState } from "react"; import { AppContext } from "../../context/applicationContext"; import LoadingIndicator from "../../components/LoadingIndicator"; // import the API from apiUtil.js import { getOthersFeedsApi } from "../../util/ApiUtil"; import MyProfile from "../../components/MyProfile"; import AddFeed from "../../components/AddFeed"; import InfiniteScroll from "react-infinite-scroll-component"; import FeedCard from "../../components/FeedCard"; const Dashboard = () => { // name spacing for the child component using UseContext hook const appContext = useContext(AppContext); // access the token which is present inside our cookies const token = appContext.getSession(); // access the user data by calling getUserData() function from AppContext const userData = appContext.getUserData(); // all the other user's feed are captured and stored inside an Array const [feedsData, setFeedsData] = useState([]); const [pageNumber, setPageNumber] = useState(0); //State variable that holds a boolean indicating whether thee are more feeds to be displayed const [hasMore, setHasMore] = useState(true); // Function is going to load the feeds of other user's const getOthersFeeds = async (loadPageNumber) => { if (loadPageNumber === 0) { setFeedsData([]); } const apiResponse = await getOthersFeedsApi(token, loadPageNumber); console.log(apiResponse); if (apiResponse.status === 1) { let feedsDataNew = []; if (loadPageNumber !== 0) { feedsDataNew = feedsData; } feedsDataNew.push(...apiResponse.payLoad.content); setFeedsData(feedsDataNew); setPageNumber(loadPageNumber + 1); if (loadPageNumber + 1 === apiResponse.payLoad.totalPages) { setHasMore(false); } else { setHasMore(true); } } }; //set the page title and fetch the feeds for the Dashboard useEffect(() => { document.title = "Home | Feed App"; getOthersFeeds(0); }, []); // if the data is being fetched from the backend, it displays loading indicator if (!userData) { return ; } return ( {/* {#MyProfile Component} */} {/* {#AddFeed Component} */} {/* {#FeedCard Component} */} getOthersFeeds(pageNumber)} hasMore={hasMore} endMessage={ Yay! You have seen it all. } refreshFunction={() => getOthersFeeds(0)} pullDownToRefresh pullDownToRefreshThreshold={50} pullDownToRefreshContent={ ↓ Pull down to refresh } releaseToRefreshContent={ ↑ Release to refresh } > {feedsData.map( ({ feedId, picture, content, createdOn, feedMetaData, user }) => ( ) )} ) } export default Dashboard

need help explaining each and every line of the code functionality ========================================================== import React, { useEffect, useContext, useState } from "react"; import { AppContext } from "../../context/applicationContext"; import LoadingIndicator from "../../components/LoadingIndicator"; // import the API from apiUtil.js import { getOthersFeedsApi } from "../../util/ApiUtil"; import MyProfile from "../../components/MyProfile"; import AddFeed from "../../components/AddFeed"; import InfiniteScroll from "react-infinite-scroll-component"; import FeedCard from "../../components/FeedCard"; const Dashboard = () => { // name spacing for the child component using UseContext hook const appContext = useContext(AppContext); // access the token which is present inside our cookies const token = appContext.getSession(); // access the user data by calling getUserData() function from AppContext const userData = appContext.getUserData(); // all the other user's feed are captured and stored inside an Array const [feedsData, setFeedsData] = useState([]); const [pageNumber, setPageNumber] = useState(0); //State variable that holds a boolean indicating whether thee are more feeds to be displayed const [hasMore, setHasMore] = useState(true); // Function is going to load the feeds of other user's const getOthersFeeds = async (loadPageNumber) => { if (loadPageNumber === 0) { setFeedsData([]); } const apiResponse = await getOthersFeedsApi(token, loadPageNumber); console.log(apiResponse); if (apiResponse.status === 1) { let feedsDataNew = []; if (loadPageNumber !== 0) { feedsDataNew = feedsData; } feedsDataNew.push(...apiResponse.payLoad.content); setFeedsData(feedsDataNew); setPageNumber(loadPageNumber + 1); if (loadPageNumber + 1 === apiResponse.payLoad.totalPages) { setHasMore(false); } else { setHasMore(true); } } }; //set the page title and fetch the feeds for the Dashboard useEffect(() => { document.title = "Home | Feed App"; getOthersFeeds(0); }, []); // if the data is being fetched from the backend, it displays loading indicator if (!userData) { return ; } return ( {/* {#MyProfile Component} /} {/ {#AddFeed Component} /} {/ {#FeedCard Component} */} getOthersFeeds(pageNumber)} hasMore={hasMore} endMessage={ Yay! You have seen it all. } refreshFunction={() => getOthersFeeds(0)} pullDownToRefresh pullDownToRefreshThreshold={50} pullDownToRefreshContent={ ↓ Pull down to refresh } releaseToRefreshContent={ ↑ Release to refresh } > {feedsData.map( ({ feedId, picture, content, createdOn, feedMetaData, user }) => ( ) )} ) } export default Dashboard

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

need help explaining each and every line of the code functionality

==========================================================

import React, { useEffect, useContext, useState } from "react";

import { AppContext } from "../../context/applicationContext";

import LoadingIndicator from "../../components/LoadingIndicator";

// import the API from apiUtil.js

import { getOthersFeedsApi } from "../../util/ApiUtil";

import MyProfile from "../../components/MyProfile";

import AddFeed from "../../components/AddFeed";

import InfiniteScroll from "react-infinite-scroll-component";

import FeedCard from "../../components/FeedCard";

const Dashboard = () => {

// name spacing for the child component using UseContext hook

const appContext = useContext(AppContext);

// access the token which is present inside our cookies

const token = appContext.getSession();

// access the user data by calling getUserData() function from AppContext

const userData = appContext.getUserData();

// all the other user's feed are captured and stored inside an Array

const [feedsData, setFeedsData] = useState([]);

const [pageNumber, setPageNumber] = useState(0);

//State variable that holds a boolean indicating whether thee are more feeds to be displayed

const [hasMore, setHasMore] = useState(true);

// Function is going to load the feeds of other user's

const getOthersFeeds = async (loadPageNumber) => {

if (loadPageNumber === 0) {

setFeedsData([]);

}

const apiResponse = await getOthersFeedsApi(token, loadPageNumber);

console.log(apiResponse);

if (apiResponse.status === 1) {

let feedsDataNew = [];

if (loadPageNumber !== 0) {

feedsDataNew = feedsData;

}

feedsDataNew.push(...apiResponse.payLoad.content);

setFeedsData(feedsDataNew);

setPageNumber(loadPageNumber + 1);

if (loadPageNumber + 1 === apiResponse.payLoad.totalPages) {

setHasMore(false);

} else {

setHasMore(true);

}

};

//set the page title and fetch the feeds for the Dashboard

useEffect(() => {

document.title = "Home | Feed App";

getOthersFeeds(0);

}, []);

// if the data is being fetched from the backend, it displays loading indicator

if (!userData) {

return <LoadingIndicator />;

}

return (

{/* {#MyProfile Component} */}

{/* {#AddFeed Component} */}

{/* {#FeedCard Component} */}

<InfiniteScroll

dataLength={feedsData.length}

next={() => getOthersFeeds(pageNumber)}

hasMore={hasMore}

endMessage={

</p>

}

refreshFunction={() => getOthersFeeds(0)}

pullDownToRefresh

pullDownToRefreshThreshold={50}

pullDownToRefreshContent={

<h3 className="text-center">↓ Pull down to refresh</h3>

}

releaseToRefreshContent={

<h3 className="text-center">↑ Release to refresh</h3>

}

{feedsData.map(

({ feedId, picture, content, createdOn, feedMetaData, user }) => (

<FeedCard

key={feedId}

feedId={feedId}

picture={picture}

content={content}

createdOn={createdOn}

username={user.username}

firstName={user.firstName}

lastName={user.lastName}

profilePicture={user.profile.picture}

feedMetaData={feedMetaData}

)

)}

</div>

</InfiniteScroll>

</article>

</main>

)

}

export default Dashboard

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