Sniberb•16mo ago

⛄Snowberb⛄ – 10-12 May 18

Why doesnt the try catch finally of this code respect the awaits, but if it is inside the (async () => {})() it does? I dont understand the syntax here

 try {
        (async () => {
          if (!...) {
            const ... = await ...;
            ...
            return;
          }
          await ...
        })();
} catch (e) {} finally {}

 try {
        (async () => {
          if (!...) {
            const ... = await ...;
            ...
            return;
          }
          await ...
        })();
} catch (e) {} finally {}

8 Replies

Sniberb•16mo ago

The above doesnt work, but this does:

     (async () => {
        try {
          if (!...) {
            const ... = await ...;
            ...
            return;
          }
          await ...
         } catch (e) {} finally {}
     })();

     (async () => {
        try {
          if (!...) {
            const ... = await ...;
            ...
            return;
          }
          await ...
         } catch (e) {} finally {}
     })();

Eva•16mo ago

Because you don't catch unawaited async functions

try {
        await (async () => {
          if (!...) {
            const ... = await ...;
            ...
            return;
          }
          await ...
        })();
} catch (e) {} finally {}

try {
        await (async () => {
          if (!...) {
            const ... = await ...;
            ...
            return;
          }
          await ...
        })();
} catch (e) {} finally {}

would work if IIFE throws something, you'd need another try catch inside of function to catch calls inside of it, obviously

Unknown User•16mo ago

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Sniberb•16mo ago

didnt understand

Eva•16mo ago

first piece of code you sent can be simplified to

try {
  asyncFunction();
catch (e) {} finally {}

try {
  asyncFunction();
catch (e) {} finally {}

you don't await async function so if it throws you don't catch anything

Sniberb•16mo ago

Eva•16mo ago

and it won't recursively catch anything within that function as well

reactibot•16mo ago

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