ArticleList.jsx

import React from "react";

class ArticleList extends React.Component {
  constructor(props) {
    super(props);
    this.state = { articles: [] };
  }

  async componentDidMount() {
    const result = await fetch("http://sample.com/");
    const articles = await result.json();
    this.setState({ articles: articles });
  }

  renderArticle = article => {
    if (!article.visible) return <React.Fragment />;

    if (article.loading) return <div className="article skeleton" />;

    return <div className="article">{article.title}</div>;
  };

  render() {
    return this.state.articles.map(renderArticle);
  }
}

export default ArticleList;