e I heard a closer term for &quot;no mutating parameters,&quot; but unfortunately I can&#39;t remember what it was now.</div></div><div class="reply-list"><div id="AAAATTv0iR4" class="reply-box"><div class="author-picture"><img src="https://lh3.googleusercontent.com/a-/AOh14GjoOXwuji1Q0p6FX0IRu-PBtgN-CxWdF8wvbNemn1A=s50-c-k-no" width="24" height="24" alt="Author profile image"></div><div class="reply-data"><div class="user-name">Evan Ovadia</div><div class="comment-content">Referential transparency maybe?</