[ES7] Handle Errors in Asynchronous Functions
This lesson shows how regular control flow statements such as try
/catch
blocks can be used to properly handle errors in asynchronous functions. Oftentimes, the resulting code is easier to read than complex promise chains with .catch()
methods.
const fetch = require('node-fetch');
const BASE_URL = 'https://api.github.com/users'; class GithubUser {
async fetchGitHubUser(handle) {
const response = await fetch(`${BASE_URL}/${handle}`);
const body = await response.json(); if (response.status !== 200) {
throw Error(body.message);
} return body;
}
} (async () => {
const github = new GithubUser(); try {
const user = await github.fetchGitHubUser('zhentian-wan');
console.log(user);
} catch(err) {
console.error(err);
} })();
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