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PORedundant/Better Performance Code VS Optimized/Less Performance Code
 

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  1. PORedundant/Better Performance Code VS Optimized/Less Performance Code
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    <p>In my case, I'm using C#, but the concept of the question would apply to Java as well. Hopefully the answer would be generic enough to cover both languages. Otherwise it's better to split the question into two.</p> <p>I've always thought of which one is a better practice.</p> <p>Does the compiler take care of enhancing the 'second' code so its performance would be as good as the 'first' code?</p> <p>Could it be worked around to get a 'better performance' <strong>and</strong> 'optimized' code at the same time?</p> <p><strong>Redundant/Better Performance Code:</strong></p> <pre><code>string name = GetName(); // returned string could be empty List&lt;string&gt; myListOfStrings = GetListOfStrings(); if(string.IsNullOrWhiteSpace(name) { foreach(string s in myListOfStrings) Console.WriteLine(s); } else { foreach(string s in myListOfStrings) Console.WriteLine(s + " (Name is: " + name); } </code></pre> <p><strong>Optimized/Less Performance Code:</strong></p> <pre><code>string name = GetName(); // returned string could be empty List&lt;string&gt; myListOfStrings = GetListOfStrings(); foreach(string s in myListOfStrings) Console.WriteLine(string.IsNullOrWhiteSpace(name) ? s : s + " (Name is: " + name); </code></pre> <p>Obviously the execution time of the 'first' code is less because it executes the condition 'string.IsNullOrWhiteSpace(name)' only once per loop. Whereas the 'second' code (which is nicer) executes the condition on every iteration.</p> <p>Please consider a long loop execution time not a short one because I know that when it is short, the performance won't differ.</p>
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    1. USyazanpro
    1. USyazanpro
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    1. COThere are many levels where optimization take place. For instance, your second example will benefit from branch prediction by the processor. Go for most clear, readable and maintainable. Worry about optimization when you actually have to.
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    2. COI'd expect the cost of `Console.WriteLine` to dominate over the cost of the concatenation...
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      1. USJon Skeet
    3. COIt's not about concatenation or Console.WriteLine. Please review the last part of the question.
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      1. USyazanpro
 

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