大约有 2,253 项符合查询结果（耗时：0.0208秒） [XML]
How to check for an undefined or null variable in JavaScript?
...s the truthiness. Which FYI is also equivalent to if (var) which will be cast to boolean, so basically completely useless...
– Cyril CHAPON
Jun 26 '18 at 9:42
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PostgreSQL, checking date relative to “today”
... a year ago and part of the day today. If you want to filter on full days, cast now()::date as Alex Howansky suggested.
– tokenizer_fsj
Jul 4 '19 at 21:40
1
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How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?
...a floating-point arithmetic, yielding 500000000.0, before it is explicitly casted back to a 64-bit integer. So it's perfectly acceptable to use a fraction of NSEC_PER_SEC.
– junjie
Jul 2 '17 at 14:05
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Enumerable.Empty() equivalent for IQueryable
... after .NET Framework 4.6. For earlier versions, you can use new object[0].Cast<T>()
– TZU
Dec 20 '19 at 21:13
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Which exception should I raise on bad/illegal argument combinations in Python?
...string knowing that non-empty strings are always True. It might save him a cast.
If the arguments have invalid values, raise ValueError. This seems more appropriate in your case:
if recurse and not save:
raise ValueError("If recurse is True, save should be True too")
Or in this specific case...
Determining whether jQuery has not found any element
...more clearance, you can also use if (!!$('#id').length), that do a boolean cast.
– Daniele Vrut
Aug 2 '14 at 21:58
6
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How to convert byte array to Bitmap
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@Julian How to byte[] cannot be cast to java.lang.String when retreving image from Sqlite stackoverflow.com/questions/63658886/…
– Kingg
Aug 30 at 16:03
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Mark parameters as NOT nullable in C#/.NET?
... @Jon, doesn't "if (arg = null)" work if there happens to be an implicit cast to bool defined? I admit it may seem perverse, but it does compile...
– Thomas S. Trias
Nov 29 '11 at 6:48
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Is there auto type inferring in Java?
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" Thats not what I meant, once you type cast it to an Object, it will give you Object's to_string" False. Absolutely 100% false.
– Louis Wasserman
Apr 21 '13 at 18:33
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How do I update a Linq to SQL dbml file?
... I had tried 1a and 1c without 1b and was getting 'Specified cast is not valid' errors when performing a simple select on a view. Including 1b fixed it for me
– tomfumb
Nov 29 '11 at 19:40
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