exception – Page 111

PHPUnit assert that an exception was thrown?

September 18, 2022 by Tarik

<?php require_once ‘PHPUnit/Framework.php’; class ExceptionTest extends PHPUnit_Framework_TestCase { public function testException() { $this->expectException(InvalidArgumentException::class); // or for PHPUnit < 5.2 // $this->setExpectedException(InvalidArgumentException::class); //…and then add your test code that generates the exception exampleMethod($anInvalidArgument); } } expectException() PHPUnit documentation PHPUnit author article provides detailed explanation on testing exceptions best practices.

How to safely call an async method in C# without await

September 17, 2022 by Tarik

If you want to get the exception “asynchronously”, you could do: MyAsyncMethod(). ContinueWith(t => Console.WriteLine(t.Exception), TaskContinuationOptions.OnlyOnFaulted); This will allow you to deal with an exception on a thread other than the “main” thread. This means you don’t have to “wait” for the call to MyAsyncMethod() from the thread that calls MyAsyncMethod; but, still allows you … Read more

Why should I not wrap every block in “try”-“catch”?

September 16, 2022 by Tarik

A method should only catch an exception when it can handle it in some sensible way. Otherwise, pass it on up, in the hope that a method higher up the call stack can make sense of it. As others have noted, it is good practice to have an unhandled exception handler (with logging) at the … Read more

Rethrowing exceptions in Java without losing the stack trace

September 15, 2022 by Tarik

catch (WhateverException e) { throw e; } will simply rethrow the exception you’ve caught (obviously the surrounding method has to permit this via its signature etc.). The exception will maintain the original stack trace.

What’s a good way to extend Error in JavaScript?

September 15, 2022 by Tarik

In ES6: class MyError extends Error { constructor(message) { super(message); this.name=”MyError”; } } source

What does “Fatal error: Unexpectedly found nil while unwrapping an Optional value” mean?

September 15, 2022 by Tarik

Background: What’s an Optional? In Swift, Optional<Wrapped> is an option type: it can contain any value from the original (“Wrapped”) type, or no value at all (the special value nil). An optional value must be unwrapped before it can be used. Optional is a generic type, which means that Optional<Int> and Optional<String> are distinct types … Read more

When to throw an exception?

September 14, 2022 by Tarik

My personal guideline is: an exception is thrown when a fundamental assumption of the current code block is found to be false. Example 1: say I have a function which is supposed to examine an arbitrary class and return true if that class inherits from List<>. This function asks the question, “Is this object a … Read more

How to write trycatch in R

September 14, 2022 by Tarik

Well then: welcome to the R world 😉 Here you go Setting up the code urls <- c( “http://stat.ethz.ch/R-manual/R-devel/library/base/html/connections.html”, “http://en.wikipedia.org/wiki/Xz”, “xxxxx” ) readUrl <- function(url) { out <- tryCatch( { # Just to highlight: if you want to use more than one # R expression in the “try” part then you’ll have to # use … Read more

Could not load file or assembly … An attempt was made to load a program with an incorrect format (System.BadImageFormatException)

September 14, 2022 by Tarik

I am pretty sure you’re having a 32-bit / 64-bit conflict. It sounds like your main project might be set to 32-bit while the class its referencing is set to 64-bit. Try looking at this SO question and this one too. Between the two of them, you should be able to figure out your problem.

The case against checked exceptions

September 13, 2022 by Tarik

I think I read the same Bruce Eckel interview that you did – and it’s always bugged me. In fact, the argument was made by the interviewee (if this is indeed the post you’re talking about) Anders Hejlsberg, the MS genius behind .NET and C#. http://www.artima.com/intv/handcuffs.html Fan though I am of Hejlsberg and his work, … Read more