&gt; Your point seems to be more about using chains of set operators rather than the fact that it is on one line.<p>It isn&#x27;t, though. My point is that sticking chains on one line makes it difficult to read as well as debug the various bits and pieces that all rest on a single line.<p>Consider the task of debugging any arbitrary error where you have little more than a line number to go by. You now need to refactor the line just to find out which method invocation is causing the error.<p>There are also readability issues with lines like these.