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POJoin a string using delimiters
 

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    <p>What is the best way to join a list of strings into a combined delimited string. I'm mainly concerned about when to stop adding the delimiter. I'll use C# for my examples but I would like this to be language agnostic.</p> <p>EDIT: I have not used StringBuilder to make the code slightly simpler.</p> <p><strong>Use a For Loop</strong></p> <pre class="lang-cs prettyprint-override"><code>for(int i=0; i &lt; list.Length; i++) { result += list[i]; if(i != list.Length - 1) result += delimiter; } </code></pre> <p><strong>Use a For Loop setting the first item previously</strong></p> <pre class="lang-cs prettyprint-override"><code>result = list[0]; for(int i = 1; i &lt; list.Length; i++) result += delimiter + list[i]; </code></pre> <p>These won't work for an IEnumerable where you don't know the length of the list beforehand so </p> <p><strong>Using a foreach loop</strong></p> <pre class="lang-cs prettyprint-override"><code>bool first = true; foreach(string item in list) { if(!first) result += delimiter; result += item; first = false; } </code></pre> <p><strong>Variation on a foreach loop</strong></p> <p>From Jon's solution</p> <pre class="lang-cs prettyprint-override"><code>StringBuilder builder = new StringBuilder(); string delimiter = ""; foreach (string item in list) { builder.Append(delimiter); builder.Append(item); delimiter = ","; } return builder.ToString(); </code></pre> <p><strong>Using an Iterator</strong></p> <p>Again from Jon</p> <pre class="lang-cs prettyprint-override"><code>using (IEnumerator&lt;string&gt; iterator = list.GetEnumerator()) { if (!iterator.MoveNext()) return ""; StringBuilder builder = new StringBuilder(iterator.Current); while (iterator.MoveNext()) { builder.Append(delimiter); builder.Append(iterator.Current); } return builder.ToString(); } </code></pre> <p>What other algorithms are there?</p>
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    1. USEd Schwehm
    1. USJohn Oxley
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    1. COdon't forget to set first to false in your foreach loop
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    2. COif you wanted this to be language agnostic, you shouldn't be worrying about c#-specific optimizations (stringbuilder).
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