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    <p>It's impossible to give a truly language-agnostic answer here as different languages and platforms handle strings differently, and provide different levels of built-in support for joining lists of strings. You could take pretty much <em>identical</em> code in two different languages, and it would be great in one and awful in another.</p> <p>In C#, you could use:</p> <pre><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>This will <em>prepend</em> a comma on all but the first item. Similar code would be good in Java too.</p> <p>EDIT: Here's an alternative, a bit like Ian's later answer but working on a general <code>IEnumerable&lt;string&gt;</code>.</p> <pre><code>// Change to IEnumerator for the non-generic IEnumerable 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>EDIT nearly 5 years after the original answer...</p> <p>In .NET 4, <a href="http://msdn.microsoft.com/en-us/library/system.string.join%28v=vs.100%29.aspx" rel="noreferrer"><code>string.Join</code></a> was overloaded pretty significantly. There's an overload taking <code>IEnumerable&lt;T&gt;</code> which automatically calls <code>ToString</code>, and there's an overload for <code>IEnumerable&lt;string&gt;</code>. So you don't need the code above any more... for .NET, anyway.</p>
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    1. POJoin a string using delimiters
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    1. CONow my solution is even shorter than yours :-)
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    2. COShorter but less efficient - taking a substring at the end still means an inelegant copy.
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    3. COI've been using that technique for about 30 years, and am amazed at the clumsy alternatives that some people produce.
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