Recent questions tagged Null

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null vs empty string in Oracle

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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null - In Objective-C why should I check if self = [super init] is not nil?

I have a general question about writing init methods in Objective-C. I see it everywhere (Apple's code, books, open ... nil? If so, in what case, and why? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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null - What's the better (cleaner) way to ignore output in PowerShell?

Closed. This question is opinion-based. It is not currently accepting answers. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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null - Possible causes of Java VM EXCEPTION_ACCESS_VIOLATION?

When a Java VM crashes with an EXCEPTION_ACCESS_VIOLATION and produces an hs_err_pidXXX.log file, what does that ... this is an SWT application on win32. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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null coalescing operator - What do two question marks together mean in C#?

Ran across this line of code: FormsAuth = formsAuth ?? new FormsAuthenticationWrapper(); What do the two question marks ... It's hard to look up in Google. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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423 views

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null - Possible causes of Java VM EXCEPTION_ACCESS_VIOLATION?

When a Java VM crashes with an EXCEPTION_ACCESS_VIOLATION and produces an hs_err_pidXXX.log file, what does that ... /140030/possible-causes-of-java-vm-exception-access-violation...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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501 views

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null - Why did father of Clojure say that Scheme's true/false are broken?

In this video, Rich Hickey introduced Clojure for Lisp programmers. At time 01:10:42, he talked about nil/false/ ... -did-father-of-clojure-say-that-schemes-true-false-are-broken...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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518 views

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null - Why did father of Clojure say that Scheme's true/false are broken?

In this video, Rich Hickey introduced Clojure for Lisp programmers. At time 01:10:42, he talked about nil/false/ ... -did-father-of-clojure-say-that-schemes-true-false-are-broken...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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null - Why shouldn't I always use nullable types in C#

I've been searching for some good guidance on this since the concept was introduced in .net 2.0. Why would I ... /830592/why-shouldnt-i-always-use-nullable-types-in-c-sharp...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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