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What does !! mean in ruby?
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Not not. It's used to convert a value to a boolean:
!!nil #=> false
!!"abc" #=> true
!!false #=> false
It's usually not necessary to use though since the only false values to Ruby are nil and false, so it's usually best to let that c...
Sort a Custom Class List
...}
Only thing you'd have to do when creating the instance of the class to convert your string containing the date into DateTime type, but it can be done easily e.g. by DateTime.Parse(String) method.
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Difference between byte vs Byte data types in C# [duplicate]
...yte"); //doesn't work, I can see no way to use"byte" directly here without converting it to "Byte"
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Find index of last occurrence of a sub-string using T-SQL
...create function fnLastIndexOf(@text varChar(max),@char varchar(1))
returns int
as
begin
return len(@text) - charindex(@char, reverse(@text)) -1
end
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Verify version of rabbitmq
...q can not start I found the only way to determine version is via installer system.
Eample Debian/Ubuntu:
dpkg -s rabbitmq-server | grep Version
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Passing variable arguments to another function that accepts a variable argument list
...hat takes a variable argument list with , ... in the signature. If you've converted the variable arguments to a va_list, you can pass the va_list to another function that only takes a va_list, but that function (or one that it calls) must have some way of knowing what's in the va_list.
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Convert an image (selected by path) to base64 string
How do you convert an image from a path on the user's computer to a base64 string in C#?
12 Answers
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“#include” a text file in a C program as a char[]
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You have two possibilities:
Make use of compiler/linker extensions to convert a file into a binary file, with proper symbols pointing to the begin and end of the binary data. See this answer: Include binary file with GNU ld linker script.
Convert your file into a sequence of character constants...
nullable object must have a value
... resolved my problem, i just change null able object to non null able, and convert datetime to string directly, not by datetimeobject.value.datetime.tostring()
– adnan
Dec 28 '16 at 12:41
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Convert text into number in MySQL query
Is it possible to convert text into number within MySQL query? I have a column with an identifier that consists a name and a number in the format of "name-number". The column has VARCHAR type. I want to sort the rows according the number (rows with the same name) but the column is sorted according d...