[swift-evolution] Proposal to change Logical NOT Operator from exclamation mark ( ! ) to something else

David Waite david at alkaline-solutions.com
Wed Feb 15 13:59:44 CST 2017

If someone came with a nice syntax I’d be for this. I can’t imagine what that would be.

I doubt there is an alternate prefix or postfix operator that would pass muster, due to ‘!’ already meaning the appropriate thing in so many languages, and swift only supporting symbolic operators.

I can’t think of a method on boolean which would read properly either, e.g.

	if isValid.not() {…}

The closest I could think to a decent bike shed color would be a global function:

	if not(isValid) {…}


> On Feb 15, 2017, at 11:10 AM, Robert Widmann via swift-evolution <swift-evolution at swift.org> wrote:
> So you've identified the problem, but what do you propose as a solution here?  
> It should be noted that a (non-stdlib) language-level answer to this question has already been discussed and rejected (https://lists.swift.org/pipermail/swift-evolution/2015-December/000032.html <https://lists.swift.org/pipermail/swift-evolution/2015-December/000032.html>).
> ~Robert Widmann
> 2017/02/15 9:02、Sadiq via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> のメッセージ:
>> Hello,
>> I would like to suggest to change Logical NOT Operator from ! to something else. 
>> It will increase the readability of the code and will avoid any confusion with the symbol used for force unwrapping of optional values. 
>> It would be easier for new programmers to learn Swift as the first language. 
>> I don't understand the rational behind using the same operator for two different purposes. 
>> Thanks and Regards,
>> Mohammad Sadiq
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