<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">On May 11, 2016, at 9:47 AM, Joe Groff <<a href="mailto:jgroff@apple.com" class="">jgroff@apple.com</a>> wrote:<br class=""><div><blockquote type="cite" class="">+1 from me. We should be consistent in either accepting or rejecting trailing commas everywhere we have comma-delimited syntax. I'm in favor of accepting it, since it's popular in languages where it's supported to enable a minimal-diff style, so that changes to code don't impact neighboring lines for purely syntactic reasons. If you add an argument to a function, without trailing comma support, a comma has to be added to dirty the previous line:<br class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><br class=""></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>--- a.swift</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>+++ a.swift</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space:pre"> </span> foo(</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space:pre"> </span> x: 0,</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- y: 1</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>+ y: 1,</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>+ z: 2</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space:pre"> </span> )</font></div><div class=""><br class=""></div><div class="">Trailing commas avoid this:</div><div class=""><br class=""></div><div class=""><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>--- a.swift</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>+++ a.swift</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space: pre;"> </span> foo(</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space: pre;"> </span> x: 0,</font></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space: pre;"> </span> y: 1,</font></div><div class=""><span class="Apple-tab-span" style="font-family: Menlo; white-space: pre;"> </span><span style="font-family: Menlo;" class="">+ z: 2,</span></div><div class=""><font face="Menlo" class=""><span class="Apple-tab-span" style="white-space: pre;"> </span> )</font></div></div></div></div></blockquote><br class=""></div><div>You’re arguing that you want to read Swift code written like this?</div><div><br class=""></div><div>-Chris</div><br class=""></body></html>