¿Podemos utilizar el manejo de excepciones en JavaScript?

Can we use exception handling in JavaScript?

JavaScript implements the try… catch… finally construct as well as the throw operator to handle exceptions. You can catch programmer-generated and runtime exceptions, but you cannot catch JavaScript syntax errors.

If a catch block cannot handle the particular exception it has caught, we can rethrow the exception. The rethrow expression causes the originally thrown object to be rethrown. Any catch blocks for the enclosing try block have an opportunity to catch the exception.

Throwing Exceptions When an exception is thrown the method stops execution right after the “throw” statement.

Exception Handling in JavaScript. An exception signifies the presence of an abnormal condition which requires special operable techniques. In programming terms, an exception is the anomalous code that breaks the normal flow of the code. Such exceptions require specialized programming constructs for its execution.

In case if an exception is re-thrown, the stack trace is restarted at the current method. Thus the list of methods calls between the method that throws the exception and the current method is lost. One way to avoid this is to catch the error and store it locally and then re-throw the error. However, in JavaScript, there is no rethrow () function.

As it turns out, try..finally has the same behavior, in at least Chrome (that is, it is not the re-throw that is the problem precisely, but the presence of any exception handler block at all.) Does anyone know of a way to rethrow an exception in Javascript but preserve the stack trace associated with it?

Rethrow an exception You can use throw to rethrow an exception after you catch it. The following example catches an exception with a numeric value and rethrows it if the value is over 50. The rethrown exception propagates up to the enclosing function or to the top level so that the user sees it.

In Java, you just throw the exception you caught, so throw e rather than just throw. Java maintains the stack trace. try { } catch (FooException e) { throw e; } catch (Exception e) { } This is a concrete example where the method throws an IOException. The final means t can only hold an exception thrown from the try block.