Something I find myself doing more and more is checking a string for empty (as in “” or null) and a conditional operator. A current example: s.SiteNumber.IsNullOrEmpty() ? “No Number” : s.SiteNumber; This is just an extension method, it’s equivalent to: string.IsNullOrEmpty(s.SiteNumber) ? “No Number” : s.SiteNumber; Since it’s empty and not null, ?? won’t … Read more
Is there a VB.NET equivalent for C#’s ?? operator? 6 Answers 6
This question already has answers here: How to get the first non-null value in Java? (13 answers) Closed 4 years ago. The community reviewed whether to reopen this question 5 months ago and left it closed: Original close reason(s) were not resolved Is it possible to do something similar to the following code in Java … Read more
In C# there’s a null-coalescing operator (written as ??) that allows for easy (short) null checking during assignment: string s = null; var other = s ?? “some default value”; Is there a python equivalent? I know that I can do: s = None other = s if s else “some default value” But is … Read more
Can someone explain the differences between ternary operator shorthand (?:) and null coalescing operator (??) in PHP? When do they behave differently and when in the same way (if that even happens)? $a ?: $b VS. $a ?? $b 14 s 14 When your first argument is null, they’re basically the same except that the … Read more
Note: this appears to have been fixed in Roslyn This question arose when writing my answer to this one, which talks about the associativity of the null-coalescing operator. Just as a reminder, the idea of the null-coalescing operator is that an expression of the form x ?? y first evaluates x, then: If the value … Read more
Is there a null coalescing operator in Javascript? For example, in C#, I can do this: String someString = null; var whatIWant = someString ?? “Cookies!”; The best approximation I can figure out for Javascript is using the conditional operator: var someString = null; var whatIWant = someString ? someString : ‘Cookies!’; Which is sorta … Read more
Ran across this line of code: FormsAuth = formsAuth ?? new FormsAuthenticationWrapper(); What do the two question marks mean, is it some kind of ternary operator? It’s hard to look up in Google. 1 19 It’s the null coalescing operator, and quite like the ternary (immediate-if) operator. See also ?? Operator – MSDN. FormsAuth = … Read more