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POFunc<> or method in test code?
 

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    <p>I saw this loop in test code:</p> <pre><code>foreach ( StuffId Id in Result.GetIdList() ) { if ( Id.Level == 3 ) { Level3Id = Id.ToString(); } if ( Id.Level == 5 ) { Level5Id = Id.ToString(); } } </code></pre> <p>Other tests imply that either there is only one Id for each level or when there are multiples for each level then the Id will be the same.</p> <p>Being slightly obsessed with LINQ right now, I first refactored to this:</p> <pre><code>IEnumerable&lt;StuffId&gt; Ids = Result.GetIdList(); Level3Id = Ids.Where( x =&gt; x.Level == 3 ).First().Id.ToString(); Level5Id = Ids.Where( x =&gt; x.Level == 5 ).First().Id.ToString(); </code></pre> <p>Then the code repetition bothered me so I refactored to this:</p> <pre><code>IEnumerable&lt;StuffId&gt; Ids = Result.GetIdList(); Func&lt;int,string&gt; IdFromLevel = level =&gt; Ids.Where( x =&gt; x.Level == level ).First().Id.ToString(); Level3Id = IdFromLevel(3); Level5Id = IdFromLevel(5); </code></pre> <p>A colleague wondered why I didn't use a method in place of the delegate. My reasoning is a method would be slightly more 'messy' because I'd have to additionally pass in the collection and that using a delegate is no big deal for a simple test (for which terse, readable and no branching are good qualities).</p> <p>I had a look on SO, of course, and found this seemingly relevant question:</p> <p><a href="https://stackoverflow.com/questions/7172038/c-func-instead-of-methods">C#: Func&lt;> instead of methods?</a></p> <p>where the consensus seems to favour a method over a delegate. Does the same apply in my case?</p>
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    1. USpetemoloy
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    1. COyes its better to go for method ...for the same reason mention in answer of that question..
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      1. USPranay Rana
    2. COThe `foreach` code uses the value of the last element, your linq code the first one. So they're not equivalent, unless there is only a single match, in which case your LINQ code should use `Single` instead of `First`.
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      1. USCodesInChaos
    3. COYour LINQ is also less efficient than the original loop, as it enumerates the collection twice.
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      1. USAlexFoxGill
 

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