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How to check whether a given string is valid JSON in Java
...is solution not only validates, but parses (and stores) the whole json. It converts numbers to Integer/Long/Double etc. This is more than just syntax check, it stores whole json in the memory. This might be significant for intensive loads. If better solution for syntax check exists?
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How do I join two lists in Java?
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It is ugly but at least its fluent and can be used without multi line lambdas. I really wish there was a fluent addAll that returned the concatinated list.
– Usman Ismail
Jan 11 '18 at 15:06
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Python: Check if one dictionary is a subset of another larger dictionary
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Convert to item pairs and check for containment.
all(item in superset.items() for item in subset.items())
Optimization is left as an exercise for the reader.
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Get all directories within directory nodejs
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@nicksweet Can you convert this to JS?
– mikemaccana
Feb 5 '15 at 13:09
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What's the scope of the “using” declaration in C++?
I'm using the 'using' declaration in C++ to add std::string and std::vector to the local namespace (to save typing unnecessary 'std::'s).
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quick random row selection in Postgres
... that contains couple of millions of rows. I have checked on the internet and I found the following
7 Answers
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JavaScript null check
... @afsantos: in reality I don't think that many (any?) values will convert to null; however, it's a best practice to use strict comparison (===) unless you really know what you're doing and want comparison after conversion (==).
– maerics
May 21 '13 at ...
How to print to console when using Qt
...hat variables do you want to print? If you mean QStrings, those need to be converted to c-Strings. Try:
std::cout << myString.toAscii().data();
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Is there a predefined enumeration for Month in the .NET library?
... answered May 22 '09 at 19:27
Andy MikulaAndy Mikula
16.5k44 gold badges2727 silver badges3939 bronze badges
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How can a Java variable be different from itself?
...same with Double.NaN.
From JLS §15.21.1. Numerical Equality Operators == and !=:
Floating-point equality testing is performed in accordance with the rules of the IEEE 754 standard:
If either operand is NaN, then the result of == is false but the result of != is true.
Indeed, the test x!=x is tru...