Async / Await

Async-await.js

function renderUserProfile(userId) {
    return fetch('/api/user').then(response => response.json()).then(user => {
        const {
            firstName,
            lastName,
            links
        } = user;

        const result = {
            fullName: `${firstName} ${lastName}`
        }
        const linksPromises = links.map(({ social_network, id }) =>
            getSocialNetworkUrl(social_network, id)
        );

        return Promise.all(linksPromises).then(links => {
            return {
                ...result,
                links
            }
        })
    })
}

function renderUserPage() {
    context.set('renderUserPage');
    return renderUserProfile(userId)
        .then(() => renderUserPosts(userId))
        .then(() => context.unset('renderUserPage'))
        .catch(err => someResolver())
}

async function renderUserPage() {
    try {
        await renderUserProfile(userId);
    } catch (error) {
        error.stack
    }

    await renderUserPosts(userId);
}