uages such as Coffeescript, and also allow helpful shorthands for some common use cases.</p>
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<h3 id="function-signatures"><a href="#function-signatures">Function signatures</a></h3>
<p>Functions are denoted with an arrow (<code>-&gt;</code>). The left side of the arrow indicates the types of the input arguments and the right side indicates the type for the return value.</p>
<p>For example, <code>parseFloat</code> has the signature <code>String -&gt; Number</code>, i.e. it takes a string as input and re