49 lines
1.1 KiB
Markdown
49 lines
1.1 KiB
Markdown
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There are no tricks here. Just replace `.catch` with `try..catch` inside `demoGithubUser` and add `async/await` where needed:
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```js run
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class HttpError extends Error {
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constructor(response) {
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super(`${response.status} for ${response.url}`);
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this.name = 'HttpError';
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this.response = response;
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}
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}
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async function loadJson(url) {
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let response = await fetch(url);
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if (response.status == 200) {
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return response.json();
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} else {
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throw new HttpError(response);
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}
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}
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// Ask for a user name until github returns a valid user
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async function demoGithubUser() {
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let user;
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while(true) {
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let name = prompt("Enter a name?", "iliakan");
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try {
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user = await loadJson(`https://api.github.com/users/${name}`);
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break; // no error, exit loop
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} catch(err) {
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if (err instanceof HttpError && err.response.status == 404) {
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// loop continues after the alert
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alert("No such user, please reenter.");
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} else {
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// unknown error, rethrow
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throw err;
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}
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}
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}
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alert(`Full name: ${user.name}.`);
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return user;
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}
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demoGithubUser();
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```
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