Helper class

<h2 id="example">Example</h2>
<p>This is also an example of a utility class. Below are <a href="/facts/Extension_method/fkvzp3Nx">extension methods</a> on the string object.
</p>
public static class PrependHelper
{
    // static functions
    public static string MeowPrepend(this string text)
    {
        return $"Meow meow {text}!";
    }

public static string WoofPrepend(this string text)
    {
        return $"Woof woof {text}!";
    }

public static string WoohPrepend(this string text)
    {
        return $"Wooh {text}!";
    }
}

<h2 id="alternative-to-helper-class">Alternative to helper class</h2>
<p>Functions which are going to be helper classes could be placed close to where they are used.
The other alternative is wrapping helper class parameters into a class as a field. That class can have a name from the business domain connected to the fields it has. The example below shows how to convert helper methods to methods on domain types:
</p>
public class Text
{
    string text;

public string MeowPrepend()
    {
        return $"Meow meow {text}!";
    }

public string WoofPrepend()
    {
        return $"Woof woof {text}!";
    }

public string WoohPrepend()
    {
        return $"Wooh {text}!";
    }
}

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Hierarchy_(object-oriented_programming)/a7R1xv8n">Hierarchy</a></li>
<li><a href="/facts/Class_diagram/DNnkq7xh">Class diagram</a> (UML)</li>
<li><a href="/facts/Class-based_programming/n3wudt1B">Class-based programming</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Tee, Sim Hui (2009-12-03). "Eliminating method redundancy for the improvement of inner class design". ACM SIGSOFT Software Engineering Notes. 34 (6): 1–3. doi:10.1145/1640162.1640174. ISSN 0163-5948. <a href="https://doi.org/10.1145/1640162.1640174" target="_blank">https://doi.org/10.1145/1640162.1640174</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"What is a helper? Is it a design pattern? Is it an algorithm?". Software Engineering Stack Exchange. Retrieved 2023-10-31. <a href="https://softwareengineering.stackexchange.com/questions/247267/what-is-a-helper-is-it-a-design-pattern-is-it-an-algorithm" target="_blank">https://softwareengineering.stackexchange.com/questions/247267/what-is-a-helper-is-it-a-design-pattern-is-it-an-algorithm</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>"Java Helper vs. Utility Classes | Baeldung". Baeldung. April 28, 2023. Retrieved October 31, 2023. <a href="https://www.baeldung.com/java-helper-vs-utility-classes" target="_blank">https://www.baeldung.com/java-helper-vs-utility-classes</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
</ol>

Helper class open-in-new

Helper class