<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=""><div><blockquote type="cite" class=""><div class="">On Feb 11, 2016, at 6:24 PM, Brent Royal-Gordon via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><div class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span class="Apple-tab-span" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: pre; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"> </span><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">exclusiveOrInPlace -> differ</span></div></blockquote></div><br class=""><div class="">While there’s a straightforward line of reasoning that led to this point, anyone who doesn’t know the history will be completely baffled when they come across:</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>x.differ(y)</div><div class=""><br class=""></div><div class="">in source. Even knowing the history, it’s awkward.</div><div class=""><br class=""></div><div class="">This really needs to be either “xor” or “symmetricDifference” to be understandable. “symmetricDifferenceInPlace” gets to be a bit ridiculous, so I’d prefer “xor[InPlace]”. “xor” is sufficiently widely-used to qualify as a term-of-art; it’s the easiest-to-read unambiguous name for this operation.</div><div class=""><br class=""></div><div class="">– Steve</div></body></html>