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Is it an algorithm? I once worked on a program in which the module and class were both called somethingsomethinghelper where somethingsomething was fairly generic too and I promptly renamed it to something that made sense to me, but I feel like I'm missing something here! A Helper class is a lesser known code smell where a coder has identified some miscellaneous, commonly used operations and attempted to make them reusable by lumping them together in an unnatural grouping.
Successive developers have then come onto the project and not realised that the helper class exists, and have consequently rewritten the same common operations, or even created more Helper classes. But seriously, the main problem with Helper classes is that they are usually operations that act on a specific class, which obviously means in OO terms that they are suffering from an acute case of Feature Envy.
This failure to package the behaviour with the data it acts on is why developers so often in my experience fail to find it. In addition to this, as you have already identified SomethingSomethingHelper is actually a terrible name. It is undescriptive, and gives you no real inkling of what sort of operations the class does it helps? I would break up such classes along the lines of related behaviour that logically group together, and then rename the new classes to reflect what it does.
A helper is a harmless additional class or method, as long as it complements an external component. When it does the contrary, then it indicates bad design because the code has been excluded from its authority, if there is any authority at all.
Here is an example of a harmless helper, I use a method called FindRep that counts the number of leading zeros. The helper method is very simple, but very inconvenient to copy-paste around and the framework does not provide any solution. However, it communicates very little about what it does. Every time I have seen it used I have found it to be a suboptimal name. Suppose we see the name "WidgetHelper" here "widget" is a stand-in name for any sort of programmable functionality, and not necessarily a UI widget :.
What do we learn from the name? We know the object or function does some kind of work secondary to the widget. It is my experience that this might not even actually be true, and one might delete "helper" from the name and improve the communication.
For another possibility, "WidgetHelper" could be wrapping the widget, such that the widget code itself may know nothing about the helper. In this case, something like "WidgetAPI" would be a better name, because that, at least, informs the user its relationship to the Widget class.
Or perhaps we delete "Helper" from the name and additionally rename Widget to something like WidgetImplementation. Alternatively, it could be wrapped and called by the widget, implying it is not part of the public API, but rather part of the implementation details. Even in this case, with this small amount of information we have an improvement on "helper.
Or it may itself be too vague - this is at the discretion of the namer. But as we have seen, the name, "helper," doesn't aid in understanding what is going on in the code, other than it is ancillary to the main object of interest. Thus, it is overly vague and nebulous, and not well-suited for the purpose of informing the user what the object does. But in any case imaginable, it would be more descriptive to use a name other than "helper" or simply remove it altogether.
As a corollary to my experience and this discussion, the choice of "helper" in a name also signals low effort or sophistication on the part of the namer correctly or not. It is, indeed, a code smell. A helper is something that works across the project and does a small thing. These guys are often not even organized into a class, they merely extend the functionality or capabilities of the language itself. Here's what I consider a very good example of a helper:. This tiny function can have a big impact on how you organize your code you'll love to put your literal lists in multiline strings but in itself, it means next to nothing.
It's a glorified regex pattern. Still, it makes your code a lot more readable when you say. So that's what helpers are. Tiny tools for generic jobs, not belonging to a specific class. You can force them into one linesOf could be a method of a string class but where they really belong is either the global namespace or one static collection of such tools. Thumb rule: if it's helpful but doesn't seem to belong anywhere, it's probably a helper.
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