Menu
I tried to use await/async on react native,but I got unexpected token error.
I added the code blow in my javascript source file:
var value = await AsyncStorage.getItem('STORAGE_KEY'); My react native version is 0.15.0.
Do I need to add some configuration to use async/await?
867
By Aman Mittal | 6 min read. AsyncStorage is a simple, asynchronous, unencrypted by default module that allows you to persist data offline in React Native apps. The persistence of data is done in a key-value storage system. There are numerous scenarios where this module can be beneficial.
Inside an async function, you can use the await keyword before a call to a function that returns a promise. This makes the code wait at that point until the promise is settled, at which point the fulfilled value of the promise is treated as a return value, or the rejected value is thrown.
The await expression causes async function execution to pause until a Promise is settled (that is, fulfilled or rejected), and to resume execution of the async function after fulfillment.
React can run this async function but can not run the cleanup function. Don't use raw async function directly in the useEffect.
I'm using async/await in my react native app and didn't have to do anything to configure or enable it in my project. My usage takes the form of...
async getCache(key){ try{ let value = await AsyncStorage.getItem(key); return value.json(); } catch(e){ console.log('caught error', e); // Handle exceptions } } Note: If you use an await inside a function that is not explicitly declared with async, you'll end up with an Unexpected token syntax error.
95
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
