"white-space:nowrap">f:<span class="type">RIn</span>&nbsp;&#8209;&gt;&nbsp;<a class="type" title="Either wraps one value of two possible types." href="../thx/Either.html">Either</a>&lt;<span class="type">L</span>, <span class="type">ROut</span>&gt;</span>):<a class="type" title="Either wraps one value of two possible types." href="../thx/Either.html">Either</a>&lt;<span class="type">L</span>, <span class="type">ROut</span>&gt;</code></p></h3><div class="doc"><p>Maps an Either<L, RIn> to and Either<L, ROut>.