<div dir="ltr">I'm uncertain but it's definitely worth considering.<div><br><div>I also think that it's weird at the moment since in most cases the exclamation mark is now something dangerous.</div></div><div>I also had a couple of bugs in my code because the operator is too easy to miss and the negation was not or no longer intended.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Dec 15, 2015 at 3:11 PM, Bruno Berisso via swift-evolution <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello,<div><br></div><div>I'm really used to negate logical expressions with this operator but it never feels confortable to me. If I need to negate some complex expression sometimes I prefer to write a temporal variable and then negate that with <b>!</b> because I fear than others, or myself, could overlook it and cause confusion.</div><div><br></div><div>Now that Swift use the same operator to force the unwrap of optional values it becomes even worse.</div><div><br></div><div>Consider this examples:</div><div><br></div><div>if someOptionalValue != nil {</div><div> ...</div><div> if !(otherBoolValue && someOptionalValue! > 0) {</div><div> ...</div><div> }</div><div>}</div><div><br></div><div>Or even worse, what happen when negating Optional<Bool> values?</div><div><br></div><div>//Best case</div><div>if let value = optionalBool where !value {</div><div> ...</div><div>}</div><div><br></div><div>//Worse case</div><div>if !optionalBool! {</div><div> ...</div><div>}</div><div><br></div><div>Now what happen with this examples if we instead use a <b>not</b> operator:</div><div><br></div><div><div>if someOptionalValue != nil {</div><div> ...</div><div> if not (otherBoolValue && someOptionalValue! > 0) {</div><div> ...</div><div> }</div><div>}</div><div><br></div><div>if let value = optionalBool where not value {</div><div> ...</div><div>}</div><div><br></div><div>if not optionalBool! {</div><div> ...</div><div>}</div></div><div><br></div><div>I'm not sure if <b>not</b> is the right path here but I really want to improve the <b>!</b> to something more clear at a glance and that doesn't have different behaviour depending where it appears in an expression.</div><div><br></div><div>Thanks,</div></div>
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