Async functions are a much easier way to create asynchronous code that has the benefits of promises, but maintains the structure of your old synchronous code. Instead of attaching .then and .catch methods, you can you can use normal semantics and try/catch statements:
var delay = require("bluebird").Promise.delay;
function oldPromiseStyleFunction()
{
return delay(1000)
.then(function()
{
console.log("One Second Passed!");
})
.then(delay(2000))
.then(function()
{
console.log("Two Seconds Passed!");
})
.catch(function()
{
console.log("An Error occured!");
})
}
async function newAsyncFunction()
{
try
{
await delay(1000);
console.log("One Second Passed!");
await delay(2000);
console.log("Two Seconds Passed!");
}
catch (anException)
{
console.log("An Error occured!");
}
}
await newAsyncFunction()
These two functions actually behave the same way.
29 comments
- posted 5 years ago byHi, thanks for sharing. There is an error in the promise version. On line 10 you need return a promise to be able to concatenate them. Right now both console logs are executed in parallel. Have a look at https://runkit.com/carusog/es7-async-functions-vs-promises
- posted 4 years ago by500k?
- posted 2 years ago by500k
- posted 2 years ago byTwo Seconds Passed
- posted 15 hours ago by1
- posted 15 hours ago by1
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- posted 15 hours ago by-1 OR 2+816-816-1=0+0+0+1
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- posted 15 hours ago byif(now()=sysdate(),sleep(15),0)
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- posted 15 hours ago by(select(0)from(select(sleep(15)))v)/*'+(select(0)from(select(sleep(15)))v)+'"+(select(0)from(select(sleep(15)))v)+"*/
- posted 15 hours ago by-1; waitfor delay '0:0:15' --
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- posted 15 hours ago by1 waitfor delay '0:0:15' --
- posted 15 hours ago byjW2uPOlr'; waitfor delay '0:0:15' --
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- posted 15 hours ago by@@xYR0f
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