7 ms·
waitForPromise().catch(foo) is exactly the same thing as waitForPromise().then(undefined, foo). Your first example is essentially the same as: waitForPromi
by csnover 7y ago
waitForPromise().catch(foo) is exactly the same thing as waitForPromise().then(undefined, foo). Your first example is essentially the same as:
waitForPromise()
.then(handleResolve)
.catch(handleReject)
.catch(handleException);
With the exception that if `handleResolve` also throws then that will be picked up by `handleReject`, whereas in `waitForPromise().then(handleResolve, handleReject).catch(handleException)` it won’t.
- pintxo 7y agoAnd you last sentence is exactly describing the issue I have. This merging of exception handling and rejection handling into one function call feels like a bad idea. As initially I thought catch() is only handling promise rejections. Then suddenly I ended up in the catch() although the Promise resolved fine, just to learn that my handleResolve code threw an exception. Unsurprisingly my handleReject code was not prepared for this.