some experience with compose

fetch-with-compose.js

    //compose
    const compose = (...fns) => arg =>
      fns.reduce((composed, fn) => fn(composed), arg);

    //fetch all urls
    const fetchUrls = urls => urls.map(url => fetch(url));

    //parse body like json
    const parseResponses = responses =>
      responses.map(response => response.then(data => data.json()));

    //resolve array of promises
    const resolveAllResults = arr => Promise.all(arr);
    
    //convert to string
    const stringify = arr => arr.then(data => data.map(d => JSON.stringify(d)));
    
    //just output for example
    function output(arr) {
    	const root = document.querySelector("#root");
    	arr.forEach(a => root.innerHTML += a);
      return arr;
    }

    //implementation
    compose(fetchUrls, parseResponses, resolveAllResults, stringify)([
      "https://jsonplaceholder.typicode.com/users",
      "https://jsonplaceholder.typicode.com/posts/1",
      "https://jsonplaceholder.typicode.com/posts/2"
    ])
        .then(output)
        .then(console.log, error => console.log("¯\_(ツ)_/¯"))