Can anyone explain why this pattern doesn't work? Or point me to some resource? function myApiFunc(callback) { /* * This pattern does NOT work! */ try { doSomeAsynchronousOperation(function (err) { if (err) throw (err); /* continue as normal */ }); } catch (ex) { callback(ex); } }
Try/catch is not async and exceptions do not bubble up through the async context, which makes sense as the caller moved on with execution. Try this in your console:
try {
console.log("see, ");
setTimeout(() => {throw new Error("oops")}, 100);
console.log(
"I can't assume here that"
+ " the prev. line succeeded"
);
} catch(e) {
console.log("error!");
}