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How do I raise the same Exception with a custom message in Python?
I have this try block in my code:
12 Answers
12
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Finding Variable Type in JavaScript
..."foo")
"object"
> typeof new Number(42)
"object"
The type of an array is still object. Here you really need the instanceof operator.
Update:
Another interesting way is to examine the output of Object.prototype.toString:
> Object.prototype.toString.call([1,2,3])
"[object Array]"
> Objec...
Why don't Java Generics support primitive types?
...ruct - the compiler turns all generic uses into casts to the right type. This is to maintain backwards compatibility with previous JVM runtimes.
This:
List<ClassA> list = new ArrayList<ClassA>();
list.add(new ClassA());
ClassA a = list.get(0);
gets turned into (roughly):
List list =...
LINQ equivalent of foreach for IEnumerable
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There is no ForEach extension for IEnumerable; only for List<T>. So you could do
items.ToList().ForEach(i => i.DoStuff());
Alternatively, write your own ForEach extension method:
public static void ForEach<T>(thi...
How to remove elements from a generic list while iterating over it?
I am looking for a better pattern for working with a list of elements which each need processed and then depending on the outcome are removed from the list.
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In C#, what happens when you call an extension method on a null object?
...al calls (i.e. it uses the "call" il instruction, not "callvirt") so there is no null check unless you write it yourself in the extension method. This is actually useful in a few cases:
public static bool IsNullOrEmpty(this string value)
{
return string.IsNullOrEmpty(value);
}
public static voi...
Fastest way to tell if two files have the same contents in Unix/Linux?
...ich I need to check whether two files contain the same data or not. I do this a for a lot of files, and in my script the diff command seems to be the performance bottleneck.
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How can I see normal print output created during pytest run?
...ome print statements in my code, and see what gets printed out when I exercise it. My usual way to "exercise" it is with existing pytest tests. But when I run these, I don't seem able to see any standard output (at least from within PyCharm, my IDE).
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The property 'value' does not exist on value of type 'HTMLElement'
...ript and am trying to create a script that will update a p-element as text is inputted in a input box.
11 Answers
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Is it safe to remove selected keys from map within a range loop?
How can one remove selected keys from a map?
Is it safe to combine delete() with range, as in the code below?
4 Answers
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