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Checking if a variable is an integer
Does Rails 3 or Ruby have a built-in way to check if a variable is an integer?
11 Answers
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Passing arrays as parameters in bash
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You can pass multiple arrays as arguments using something like this:
takes_ary_as_arg()
{
declare -a argAry1=("${!1}")
echo "${argAry1[@]}"
declare -a argAry2=("${!2}")
echo "${argAry2[@]}"
}
try_with_local_arys()
{
# array variables could have local scope
local d...
Why does .NET foreach loop throw NullRefException when collection is null?
So I frequently run into this situation... where Do.Something(...) returns a null collection, like so:
11 Answers
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Practical uses for AtomicInteger
...nteger and other Atomic variables allow concurrent accesses. In what cases is this class typically used though?
12 Answers
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Convert Pixels to Points
...ocate a simple formula. Let's assume a standard 96dpi, how do I calulate this conversion?
12 Answers
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Getting the first character of a string with $str[0]
... and I've noticed that $str[0] works great. I am just not sure whether this is 'good practice', as that notation is generally used with arrays. This feature doesn't seem to be very well documented so I'm turning to you guys to tell me if it's all right – in all respects – to use this notation?...
What are forward declarations in C++?
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Why forward-declare is necessary in C++
The compiler wants to ensure you haven't made spelling mistakes or passed the wrong number of arguments to the function. So, it insists that it first sees a declaration of 'add' (or any other types, class...
Different ways of adding to Dictionary
What is the difference in Dictionary.add(key, value) and Dictionary[key] = value ?
8 Answers
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In C#, how to check if a TCP port is available?
...r generally to connect to a socket how can I first check if a certain port is free on my machine?
19 Answers
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Placement of the asterisk in pointer declarations
I've recently decided that I just have to finally learn C/C++, and there is one thing I do not really understand about pointers or more precisely, their definition.
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