stream-saga/src/components/Posts.jsx

import React, { useEffect } from "react"
import { connect } from "react-redux"
import { getHillaryData } from "../actions/index"
import { getTrumpData } from "../actions/index"

export function Post(props) {
	let { articles, candidate, getHillaryData, getTrumpData } = props

	// Fetch tweets when user clicks on candidate's button
	useEffect(() => {
		if (candidate === 'Hillary Clinton') {
			getHillaryData()
		}
		else if (candidate === 'Donald Trump') {
			getTrumpData()
		}
	}, [candidate, getHillaryData, getTrumpData])

	let cand = candidate === undefined ? 'Not set' : candidate

	return (
		<div>
			<p>@{cand}</p>
			<ul className="list-group list-group-flush">
				{articles.map(el => (
					<li className="list-group-item" key={el.id_str}>
						<p>{el.created_at}</p>
						<p>{el.text}</p>
					</li>
				))}
			</ul>
		</div>
	)
}

function mapStateToProps(state) {
	return {
		articles: state.remoteArticles.slice(0, 10),
		candidate: state.candidate
	}
}

export default connect(
	mapStateToProps,
	{ getHillaryData, getTrumpData }
)(Post)