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When should iteritems() be used instead of items()?
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In Python 2.x - .items() returned a list of (key, value) pairs. In Python 3.x, .items() is now an itemview object, which behaves different - so it has to be iterated over, or materialised... So, list(dict.items()) is required for what wa...
How to join two JavaScript Objects, without using JQUERY [duplicate]
...j2[key]);
3 - Object.assign():
(Browser compatibility: Chrome: 45, Firefox (Gecko): 34, Internet Explorer: No support, Edge: (Yes), Opera: 32, Safari: 9)
const result = Object.assign({}, obj1, obj2);
4 - Spread Operator:
Standardised from ECMAScript 2015 (6th Edition, ECMA-262):
Defined i...
Writing a pandas DataFrame to CSV file
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I would add index=False to drop the index.
– Medhat
Jul 3 '19 at 20:48
16
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What's the algorithm to calculate aspect ratio?
... numbers. So the GCD for 6 and 10 is 2, the GCD for 44 and 99 is 11.
For example, a 1024x768 monitor has a GCD of 256. When you divide both values by that you get 4x3 or 4:3.
A (recursive) GCD algorithm:
function gcd (a,b):
if b == 0:
return a
return gcd (b, a mod b)
In C:
stat...
Why can't variables be declared in a switch statement?
...stency in the code. In the old days, you might have automatically got an "extra" stack frame, but now that should not be the case for any decent optimizing compiler.
– Tall Jeff
Sep 18 '08 at 14:37
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Is 'float a = 3.0;' a correct statement?
...rios.
For performance reasons:
Specifically, consider:
float foo(float x) { return x * 0.42; }
Here the compiler will emit a conversion (that you will pay at runtime) for each returned value. To avoid it you should declare:
float foo(float x) { return x * 0.42f; } // OK, no conversion require...
How to run a shell script in OS X by double-clicking?
I have a shell script that has user execution permission on OS X, but when I double click on it, it opens in a text editor. How can I get it to run by double-clicking it?
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Move an item inside a list?
In Python, how do I move an item to a definite index in a list?
5 Answers
5
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ModelState.IsValid == false, why?
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Notice that error can be Message or Exception; for example Html.ValidationSummary does not display exceptions (for security reasons I guess); maybe that's why you don't see errors? How do you check for no errors?
– queen3
N...
How does generic lambda work in C++14?
...ere introduced in C++14.
Simply, the closure type defined by the lambda expression will have a templated call operator rather than the regular, non-template call operator of C++11's lambdas (of course, when auto appears at least once in the parameter list).
So your example:
auto glambda = [] (a...