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Check the result of console.log (waitForPromise ()) if you are uncertain. A check of console.log (result) within the async function will print out what you expect, but the return from the async function happens immediately without blocking and returns a promise.
- What Is A Promise?
- Using Promises in React on Page Load
- Onclick
Promises allow you to perform asynchronous operations in JavaScript. To construct a Promise from scratch, you can use the Promise constructor. This takes a function which takes two parameters: “resolve”, a function to call when the operation completes, and “reject”, a function to call if the operation fails. You then have to call one of these funct...
To use the value of a Promise in React, you can use a useEffect()hook with an empty dependency array to wait for the promise to resolve, and store the result in the value of a useState hook. Here’s an example of using this method to get a random cat, using the CatAAS API. When the page loads, the useEffect’s function will be called. This will perfo...
With the above example, we have to refresh the page in order to get a new cat. This is a bit inconvenient, so lets refactor our site so that we can get a new cat through a button. We’ve refactored the contents of our useEffect function to their own separate function, so that we can trigger it whenever we want Now when I click the button, the onClic...
With Asynchronous execution, you begin a routine, and let it run in the background while you start your next, then at some point, say "wait for this to finish". It's more like: Start A->B->C->D->Wait for A to finish
Feb 6, 2024 · The other way of handling promises in React is the async/await syntax. You can “await” a function to synchronously wait for the promise to settle: const myPromise = new Promise((resolve) => { setTimeout(() => { resolve('follow @marile0n'); }, 1000); //1000ms = 1s }); const result = await myPromise; console.log(result);
Feb 6, 2024 · The other way of handling promises in React is the async/await syntax. You can “await” a function to synchronously wait for the promise to settle: const myPromise = new Promise((resolve) => {. setTimeout(() => {. resolve('follow @marile0n'); }, 1000); //1000ms = 1s. });
May 9, 2022 · Let’s take a Promise-based refactor things out and investigate how to use async/await functions with React’s useEffect hook, as we could easily slip up and cause ourselves some headache without knowing a few key points.
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Apr 7, 2024 · A sleep or delay function is used to wait for N milliseconds before performing an action. The function takes the number of milliseconds as a parameter and uses the setTimeout method to wait for the specified number of milliseconds before resolving a Promise.