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How should one use std::optional?
...std::string s, int& i);
Another way that this could be done is especially bad:
int* try_parse_int(std::string s); //return nullptr if fail
This requires dynamic memory allocation, worrying about ownership, etc. - always prefer one of the other two signatures above.
Another example:
clas...
Watch multiple $scope attributes
...e watchExpression array
// i.e.
// newValues[0] -> $scope.foo
// and
// newValues[1] -> $scope.bar
});
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Validate that end date is greater than start date with jQuery
...
I had to modify it slightly to allow for blank end dates in my app, but this did the bulk. code if (value == 0) { return true; } else if (!/Invalid|NaN/... code
– Frank Luke
Jun 23 '11 at 14:48
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Finding median of list in Python
...ow do you find the median of a list in Python? The list can be of any size and the numbers are not guaranteed to be in any particular order.
...
Can an interface extend multiple interfaces in Java?
...in of the diamond problem?) __Tried it and the sensible thing happens: not allowed if the return type is different.
– Daniel
Jan 6 '15 at 17:38
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Better way to cast object to int
...() — For converting an object of unknown type. It will use an explicit and implicit conversion or IConvertible implementation if any are defined.
as int? — Note the "?". The as operator is only for reference types, and so I used "?" to signify a Nullable<int>. The "as" operator works li...
Can I mask an input text in a bat file?
...
Up to XP and Server 2003, you can make use of another included tool (VBScript) - the following two scripts do the job you want.
First, getpwd.cmd:
@echo off
<nul: set /p passwd=Password:
for /f "delims=" %%i in ('cscript /nologo...
TypeScript sorting an array
... a property, bear in mind the above information about being able to short-hand number types. The below example works irrespective of the type.
var objectArray: { age: number; }[] = [{ age: 10}, { age: 1 }, {age: 5}];
var sortedArray: { age: number; }[] = objectArray.sort((n1,n2) => {
if (n1...
What underlies this JavaScript idiom: var self = this?
...s article on alistapart.com. (Ed: The article has been updated since originally linked)
self is being used to maintain a reference to the original this even as the context is changing. It's a technique often used in event handlers (especially in closures).
Edit: Note that using self is now discour...
How to change a table name using an SQL query?
... you:
Caution: Changing any part of an object name could break scripts and
stored procedures.
but your table name will be changed.
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