Syntaxe in spark and scala : <p>I'm an amateur in spark and scala, can anyone told me what this syntaxe do ? :</p>

<pre><code>val encoded_props = props.map( _.split(" ")).map(t =&gt; Map((t(1),t(0).toLong))).reduce((a1,a2)=&gt;a1++a2)
</code></pre>

<p>Thanks</p>
