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What happens when a duplicate key is put into a HashMap?
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By definition, the put command replaces the previous value associated with the given key in the map (conceptually like an array indexing operation for primitive types).
The map simply drops its reference to the value. If no...
How to delete items from a dictionary while iterating over it?
... a list.
As pointed out in comments simply convert mydict.keys() to a list by list(mydict.keys()) and it should work.
A simple test in the console shows you cannot modify a dictionary while iterating over it:
>>> mydict = {'one': 1, 'two': 2, 'three': 3, 'four': 4}
>>> for k,...
Why does !{}[true] evaluate to true in JavaScript?
...ue] is parsed as an empty statement block (not an object literal) followed by an array containing true, which is true.
On the other hand, applying the ! operator makes the parser interpret {} as an object literal, so the following {}[true] becomes a member access that returns undefined, and !{}[tru...
How do I find the location of the executable in C? [duplicate]
... #include <windows.h> and use the path string provided automatically by Windows in _pgmptr. It's easier than using the GetModuleFileName function because that has the possibility of failing.
– rsethc
May 1 '13 at 1:43
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Hiding the legend in Google Chart
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You can disable the legend by using 'none' as the position:
legend: {position: 'none'}
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Calculate the execution time of a method
...use DateTime to measure time execution in .NET.
UPDATE:
As pointed out by @series0ne in the comments section: If you want a real precise measurement of the execution of some code, you will have to use the performance counters that's built into the operating system. The following answer contains ...
@Nullable annotation usage
...).orElse("Really Nothing");
}
You can also throw some exception in there by swapping .orElse to
orElseThrow(() -> new Exception("Dont' send a null")).
If you don't want to use @Nullable, which adds nothing functionally, why not just name the parameter with mayBe... so your intention is clear....
how to use ng-option to set default value of select element
... them.But if we dont know the options and how can we display the first one by default?
– H Varma
Nov 23 '16 at 11:33
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Tuning nginx worker_process to obtain 100k hits per min
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@Ethan, why it should be devided by 2? If every second we get 100 new connections, and timeout is 5, then strting with sixth second, we will constantly have 5*100 connections that is still not terminated on the server side. we may have less if some users are...
Boolean literals in PowerShell
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For completeness, you can also produce boolean value by doing New-Object -Type Boolean for false and ! (New-Object -Type Boolean) for true
– Raghu Dodda
Sep 5 at 1:36
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