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promise.all demo and small challenge, also showing off promise hell
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| 1) Find a way to push user objects returned from the api into the users array, no loops, only choice was to go into promise hell | |
| 2) Using Promise.all get 3 user objects and store them in a users array |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>Document</title> | |
| </head> | |
| <body> | |
| <button>Get data</button> | |
| <script src="./promise-hell.js"></script> | |
| </body> | |
| </html> |
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| // where we store out user objects | |
| const users = [] | |
| // event listener on button | |
| const button = document.querySelector("button") | |
| button.addEventListener("click", promiseAll) | |
| // the nicer syntax for handling multiple promises | |
| function promiseAll() { | |
| const userOne = fetch("https://randomuser.me/api/") | |
| const userTwo = fetch("https://randomuser.me/api/") | |
| const userThree = fetch("https://randomuser.me/api/") | |
| Promise.all([userOne, userTwo, userThree]) | |
| .then((arrOfRes) => { | |
| arrOfRes.forEach((response) => { | |
| pushUserObjects(response.json()) | |
| }) | |
| console.log(users) | |
| }) | |
| } | |
| // function that pushes object into array | |
| const pushUserObjects = (json) => { | |
| json.then((data) => { | |
| users.push(data.results[0]) | |
| }) | |
| } | |
| // promise hell | |
| function getUserData() { | |
| fetch("https://randomuser.me/api/") | |
| .then((response) => { | |
| return response.json() | |
| }) | |
| .then((data) => { | |
| const user = data.results[0] | |
| users.push(user) | |
| }) | |
| fetch("https://randomuser.me/api/") | |
| .then((response) => { | |
| return response.json() | |
| }) | |
| .then((data) => { | |
| const user = data.results[0] | |
| users.push(user) | |
| }) | |
| fetch("https://randomuser.me/api/") | |
| .then((response) => { | |
| return response.json() | |
| }) | |
| .then((data) => { | |
| const user = data.results[0] | |
| users.push(user) | |
| displayResult(users) | |
| }) | |
| } | |
| function displayResult(users) { | |
| console.log(users) | |
| } | |
| getUserData() |
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