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    <p>The term "splat operator" comes from Ruby, where the <code>*</code> character (sometimes called the "splat"—see <a href="http://www.catb.org/jargon/html/S/splat.html" rel="noreferrer">the Jargon File entry</a>) is used to indicate that an entry in an argument list should "soak up" a list of arguments.</p> <p>CoffeeScript adopted Ruby-style splats very early on (see <a href="https://github.com/jashkenas/coffee-script/issues/16" rel="noreferrer">issue 16</a>), but at Douglas Crockford's suggestion, the syntax was changed from <code>*x</code> to <code>x...</code> a couple of weeks later (see <a href="https://github.com/jashkenas/coffee-script/issues/45" rel="noreferrer">issue 45</a>). Nevertheless, CoffeeScripters still refer to the syntax as the "splat" or "splat operator."</p> <p>As to what they actually do, splats slice the <code>arguments</code> object in such a way that the splatted argument becomes an array of all "extra" arguments. The most trivial example is</p> <pre><code>(args...) -&gt; </code></pre> <p>In this case, <code>args</code> will simply be an array copy of <code>arguments</code>. Splatted arguments can come either before, after, or between standard arguments:</p> <pre><code>(first, rest...) -&gt; (rest..., last) -&gt; (first, rest..., last) -&gt; </code></pre> <p>In the first two cases, if the function receives 0-1 arguments, <code>rest</code> will be an empty array. In the last case, the function needs to receive more than 2 arguments for <code>rest</code> to be non-empty.</p> <p>Since JavaScript doesn't allow multiple signatures for functions with the same name (the way C and Java do), splats are a huge time-saver for dealing with varying numbers of arguments.</p>
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    1. POWhat does "Splats" mean in the CoffeeScript tutorial?
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    1. COSimilar to the C# [`params`](http://msdn.microsoft.com/en-us/library/w5zay9db.aspx) keyword.
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    2. COWhen would I ever need to use this?
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    3. COwhen you are unsure of the number of params that you want to accept .
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