<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div><br class=""><blockquote type="cite" class=""><div class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">However, I find that I'm having trouble figuring out what I get for free when I implement a protocol. In principle, I like conditional conformances and synthesized implementation of protocol methods, but I find that they both make it harder to figure out what I need to implement, and what are going to be the performance characteristics of methods that I choose to not implement.</span></div></blockquote></div><br class=""><div class=""><br class=""></div><div class="">If you're thinking specifically about the standard library, the documentation for protocols like Sequence shows whether a member is required, and whether it provides a default implementation.</div><div class=""><br class=""></div><div class=""><a href="https://developer.apple.com/documentation/swift/sequence#2923865" class="">https://developer.apple.com/documentation/swift/sequence#2923865</a></div><div class=""><br class=""></div><div class="">Have you noticed that before, or is it still tricky to find requirements given the presentation?</div><div class=""><br class=""></div><div class="">-Kyle</div></body></html>