Functional programming in JavaScript

fetchClient.js

const fetch = require("node-fetch");

export const fetchClient = baseUrl => endpoint => (success, failure) => {
  fetch(baseUrl + endpoint)
    .then(res => res.json())
    .then(success)
    .catch(failure);
};

github.js

import { fetchClient } from './fetchClient';

const github = fetchClient('https://api.github.com');

export const getGithubUsers = github('/users');

gitlab.js

import { fetchClient } from './fetchClient';

const gitlab = fetchClient('https://gitlab.com/api/v4');

export getGitlabUsers = gitlab('/users');

index.js

import { getGithubUsers } from './github';
import { getGitlabUsers } from './gitlab';

getGithubUsers(data => console.log('Success!', data), err => console.log('Failure!', err);
getGitlabUsers(data => console.log('Success!', data), err => console.log('Failure!', err);