<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="">Yes indeed! Apparently union works with the generic but insert did not. Strange. Anyway, I ended up here:<div class=""><br class=""></div><div class="">func reducedOptions<T: OptionSet>(_ options: [T]) -> T {<br class=""> return options.reduce(T()) { return $0.union($1) }<br class="">}</div><div class=""><br class=""></div><div class="">Thanks!</div><div class=""><br class=""></div><div class="">Jon</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Nov 3, 2016, at 9:56 PM, Erica Sadun <<a href="mailto:erica@ericasadun.com" class="">erica@ericasadun.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">How about<div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">func</span><span style="font-variant-ligatures: no-common-ligatures" class=""> joinOptionSets<OS: </span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">OptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">>(</span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">_</span><span style="font-variant-ligatures: no-common-ligatures" class=""> sets: [</span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">OS</span><span style="font-variant-ligatures: no-common-ligatures" class="">]) -> </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">OS</span><span style="font-variant-ligatures: no-common-ligatures" class=""> {</span></div><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">return</span><span style="font-variant-ligatures: no-common-ligatures" class=""> sets.</span><span style="font-variant-ligatures: no-common-ligatures; color: #3e1e81" class="">reduce</span><span style="font-variant-ligatures: no-common-ligatures" class="">([] </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">as</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">OS</span><span style="font-variant-ligatures: no-common-ligatures" class="">) {</span></div><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> (result, set) </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">in</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">return</span><span style="font-variant-ligatures: no-common-ligatures" class=""> result.</span><span style="font-variant-ligatures: no-common-ligatures; color: #3e1e81" class="">union</span><span style="font-variant-ligatures: no-common-ligatures" class="">(set)</span></div><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> }</span></div><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">}</span></div><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo; min-height: 19px;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""></span><br class=""></div><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo; color: rgb(49, 89, 93);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">joinOptionSets</span><span style="font-variant-ligatures: no-common-ligatures;" class="">(</span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">sets</span><span style="font-variant-ligatures: no-common-ligatures;" class="">).</span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">rawValue</span></div><div class=""><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class=""><br class=""></span></div><div class=""><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class=""><br class=""></span></div><div class=""><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">-- E</span></div><div class=""><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class=""><br class=""></span></div><div style="" class=""><blockquote type="cite" class=""><div class="">On Nov 3, 2016, at 7:48 PM, Erica Sadun via swift-users <<a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Like this?</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">let</span><span style="font-variant-ligatures: no-common-ligatures" class=""> sets: [</span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">] = [</span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">(strings: [</span><span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b" class="">"one"</span><span style="font-variant-ligatures: no-common-ligatures" class="">]), </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">(strings: [</span><span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b" class="">"two"</span><span style="font-variant-ligatures: no-common-ligatures" class="">]), </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">(strings: [</span><span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b" class="">"one"</span><span style="font-variant-ligatures: no-common-ligatures" class="">, </span><span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b" class="">"two"</span><span style="font-variant-ligatures: no-common-ligatures" class="">])]</span></div><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">let</span><span style="font-variant-ligatures: no-common-ligatures" class=""> unioned = </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">sets</span><span style="font-variant-ligatures: no-common-ligatures" class="">.</span><span style="font-variant-ligatures: no-common-ligatures; color: #3e1e81" class="">reduce</span><span style="font-variant-ligatures: no-common-ligatures" class="">(</span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">(rawValue: </span><span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">0</span><span style="font-variant-ligatures: no-common-ligatures" class="">)) {</span></div><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> (result, set) </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">in</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">return</span><span style="font-variant-ligatures: no-common-ligatures" class=""> result.</span><span style="font-variant-ligatures: no-common-ligatures; color: #3e1e81" class="">union</span><span style="font-variant-ligatures: no-common-ligatures" class="">(set)</span></div><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">}</span></div><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo; color: rgb(79, 129, 135);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">unioned</span><span style="font-variant-ligatures: no-common-ligatures;" class="">.</span><span style="font-variant-ligatures: no-common-ligatures" class="">rawValue</span></div></div><div class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class=""></span></div><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Nov 3, 2016, at 7:44 PM, Jon Shier <<a href="mailto:jon@jonshier.com" class="">jon@jonshier.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Thanks Erica. I’ve been able to transform arrays of strings into arrays of my OptionSets using an enum approach like you describe. I was looking more for a generic approach that I could apply to all of the various OptionSets I have to decode from JSON. I suppose whether it’s from an array of strings or array of the OptionSet is less important, but getting to the array of the OptionSet itself is something I can already do. <div class=""><br class=""></div><div class=""><br class=""></div><div class="">Thanks,</div><div class=""><br class=""></div><div class="">Jon</div><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Nov 3, 2016, at 9:37 PM, Erica Sadun <<a href="mailto:erica@ericasadun.com" class="">erica@ericasadun.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Maybe something like this? Or you could just bitwise || individual sets. Or you could use a dictionary to lookup [string: rawValue]. etc.<div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 16px; line-height: normal; font-family: Menlo;" class=""><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">public</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">struct</span><span style="font-variant-ligatures: no-common-ligatures" class=""> MyOptionSet: </span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">OptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class=""> {</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">public</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">static</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">let</span><span style="font-variant-ligatures: no-common-ligatures" class=""> one = </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">(rawValue: </span><span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">1</span><span style="font-variant-ligatures: no-common-ligatures" class=""> << </span><span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">0</span><span style="font-variant-ligatures: no-common-ligatures" class="">)</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">public</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">static</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">let</span><span style="font-variant-ligatures: no-common-ligatures" class=""> two = </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">(rawValue: </span><span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">1</span><span style="font-variant-ligatures: no-common-ligatures" class=""> << </span><span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">1</span><span style="font-variant-ligatures: no-common-ligatures" class="">)</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">public</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">static</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">let</span><span style="font-variant-ligatures: no-common-ligatures" class=""> three = </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">(rawValue: </span><span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">1</span><span style="font-variant-ligatures: no-common-ligatures" class=""> << </span><span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">2</span><span style="font-variant-ligatures: no-common-ligatures" class="">)</span></div><div style="margin: 0px; line-height: normal; min-height: 19px;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><br class="webkit-block-placeholder"></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">public</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">var</span><span style="font-variant-ligatures: no-common-ligatures" class=""> rawValue: </span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">Int</span><span style="font-variant-ligatures: no-common-ligatures" class=""> { </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">return</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">_rawValue</span><span style="font-variant-ligatures: no-common-ligatures" class=""> }</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">public</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">init</span><span style="font-variant-ligatures: no-common-ligatures" class="">(rawValue: </span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">Int</span><span style="font-variant-ligatures: no-common-ligatures" class="">) { </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">self</span><span style="font-variant-ligatures: no-common-ligatures" class="">.</span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">_rawValue</span><span style="font-variant-ligatures: no-common-ligatures" class=""> = rawValue }</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">private</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">let</span><span style="font-variant-ligatures: no-common-ligatures" class=""> _rawValue: </span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">Int</span></div><div style="margin: 0px; line-height: normal; min-height: 19px;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><br class="webkit-block-placeholder"></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">private</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">enum</span><span style="font-variant-ligatures: no-common-ligatures" class=""> StringEnum: </span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">String</span><span style="font-variant-ligatures: no-common-ligatures" class=""> { </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">case</span><span style="font-variant-ligatures: no-common-ligatures" class=""> one, two, three }</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">public</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">init</span><span style="font-variant-ligatures: no-common-ligatures" class="">(strings: [</span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">String</span><span style="font-variant-ligatures: no-common-ligatures" class="">]) {</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">var</span><span style="font-variant-ligatures: no-common-ligatures" class=""> set = </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">()</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> strings.</span><span style="font-variant-ligatures: no-common-ligatures; color: #3e1e81" class="">flatMap</span><span style="font-variant-ligatures: no-common-ligatures" class="">({ </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">StringEnum</span><span style="font-variant-ligatures: no-common-ligatures" class="">(rawValue: $0) })</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> .</span><span style="font-variant-ligatures: no-common-ligatures; color: #3e1e81" class="">flatMap</span><span style="font-variant-ligatures: no-common-ligatures" class="">({ </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">(rawValue: </span><span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">1</span><span style="font-variant-ligatures: no-common-ligatures" class=""> << $0.</span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">hashValue</span><span style="font-variant-ligatures: no-common-ligatures" class="">) })</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> .</span><span style="font-variant-ligatures: no-common-ligatures; color: #3e1e81" class="">forEach</span><span style="font-variant-ligatures: no-common-ligatures" class=""> { set.</span><span style="font-variant-ligatures: no-common-ligatures; color: #3e1e81" class="">insert</span><span style="font-variant-ligatures: no-common-ligatures" class="">($0) }</span></div><div style="margin: 0px; line-height: normal; color: rgb(79, 129, 135);" class=""><span style="font-variant-ligatures: no-common-ligatures;" class=""> </span><span style="font-variant-ligatures: no-common-ligatures" class="">_rawValue</span><span style="font-variant-ligatures: no-common-ligatures;" class=""> = set.</span><span style="font-variant-ligatures: no-common-ligatures" class="">rawValue</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> }</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">}</span></div><div style="margin: 0px; line-height: normal; min-height: 19px;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""></span><br class=""></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">let</span><span style="font-variant-ligatures: no-common-ligatures" class=""> stringArray: [</span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">String</span><span style="font-variant-ligatures: no-common-ligatures" class="">] = [</span><span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b" class="">"one"</span><span style="font-variant-ligatures: no-common-ligatures" class="">, </span><span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b" class="">"three"</span><span style="font-variant-ligatures: no-common-ligatures" class="">]</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">let</span><span style="font-variant-ligatures: no-common-ligatures" class=""> stringOptions = </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">MyOptionSet</span><span style="font-variant-ligatures: no-common-ligatures" class="">(strings: </span><span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">stringArray</span><span style="font-variant-ligatures: no-common-ligatures" class="">)</span></div><div style="margin: 0px; line-height: normal; color: rgb(79, 129, 135);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">stringOptions</span><span style="font-variant-ligatures: no-common-ligatures;" class="">.</span><span style="font-variant-ligatures: no-common-ligatures" class="">rawValue</span></div><div class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class=""></span></div></div><div class=""><blockquote type="cite" class=""><div class="">On Nov 3, 2016, at 7:09 PM, Jon Shier via swift-users <<a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Swifters:<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>I’m dealing with a JSON API where sets of options are returned as arrays of strings. Representing these as OptionSets seems ideal. I can decode the arrays of strings into an array of individual OptionSet values, but I’ve run into a dead end when trying generically reduce the array of OptionSets to a single OptionSet value. I’ve tried variety of ways of definition a Collection extension, even tried defining a global function, but I can’t seem to use the OptionSet sequence initializer or reduce itself (cannot invoke insert with argument of type (OptionSet) (or T)). Any guidance here? <br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Here’s what I’ve tried:<br class=""><br class="">extension Collection where Iterator.Element == OptionSet {<br class=""><br class=""> func reduced() -> Iterator.Element {<br class=""> return reduce(Iterator.Element()) {<br class=""> var newResult = $0<br class=""> newResult.insert($1)<br class=""> return newResult<br class=""> }<br class=""> }<br class=""><br class="">}<br class=""><br class="">extension Collection where Iterator.Element == OptionSet {<br class=""><br class=""> func reduced<T: OptionSet>() -> T {<br class=""> return reduce(T()) {<br class=""> var newResult = $0<br class=""> newResult.insert($1)<br class=""> return newResult<br class=""> }<br class=""> }<br class=""><br class="">}<br class=""><br class=""><br class="">extension Collection where Iterator.Element == OptionSet {<br class=""> func reduced() -> Iterator.Element {<br class=""> return Iterator.Element(self)<br class=""> }<br class="">}<br class=""><br class="">func reduced<T: OptionSet>(_ options: [T]) -> T {<br class=""> return options.reduce(T()) {<br class=""> var newResult = $0<br class=""> newResult.insert($1)<br class=""><br class=""> return newResult<br class=""> }<br class="">}<br class=""><br class="">Jon Shier<br class="">_______________________________________________<br class="">swift-users mailing list<br class=""><a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a><br class=""><a href="https://lists.swift.org/mailman/listinfo/swift-users" class="">https://lists.swift.org/mailman/listinfo/swift-users</a><br class=""></div></div></blockquote></div><br class=""></div></div></div></blockquote></div><br class=""></div></div></div></blockquote></div><br class=""></div>_______________________________________________<br class="">swift-users mailing list<br class=""><a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a><br class=""><a href="https://lists.swift.org/mailman/listinfo/swift-users" class="">https://lists.swift.org/mailman/listinfo/swift-users</a><br class=""></div></blockquote></div><br class=""></div></div></div></blockquote></div><br class=""></div></body></html>