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Reference: What is variable scope, which variables are accessible from where and what are “undefined
...their values after that function completes. PHP has a well known static keyword that is widely used in object-oriented PHP for defining static methods and properties but one should keep in mind that static may also be used inside functions to define static variables.
What is it 'static variable'?
...
How do I prompt for Yes/No/Cancel input in a Linux shell script?
...ook like this:
set -- $(locale LC_MESSAGES)
yesptrn="$1"; noptrn="$2"; yesword="$3"; noword="$4"
while true; do
read -p "Install (${yesword} / ${noword})? " yn
case $yn in
${yesptrn##^} ) make install; break;;
${noptrn##^} ) exit;;
* ) echo "Answer ${yesword} / ${no...
How to check if an object is a certain type
...turns a Type object which contains the type for the variable Foo. In other words, it tells you what Foo is an instance of.
GetType(Bar) returns a Type object which contains the type for the TypeName Bar.
In some instances, the type an object has been Cast to is different from the type an object was ...
How to calculate time elapsed in bash script?
... must use the 10:33:56 string, well, just convert it to seconds,
also, the word seconds could be abbreviated as sec:
string1="10:33:56"
string2="10:36:10"
StartDate=$(date -u -d "$string1" +"%s")
FinalDate=$(date -u -d "$string2" +"%s")
date -u -d "0 $FinalDate sec - $StartDate sec" +"%H:%M:%S"
N...
What is Type-safe?
... Wait, your definition of type-safety does not have a single word "type" :D if no operation leads to undefined behavior.
– VasiliNovikov
Sep 2 '14 at 12:09
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How do DATETIME values work in SQLite?
...t as a type or storage class. Yes, the documentation actually contains the word "DATETIME".
– Jasper
Oct 13 '17 at 11:41
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Calling C++ class methods via a function pointer
...nimal method pointer is not compatible with a Dog method pointer, in other words you can't assign a Dog* (*)() to a variable of type Animal* (*)().
The static newDog method is a simple example of a factory, which simply creates and returns new instances. Being a static function, it has a regular t...
Python logging not outputting anything
...gger:
'root':{'handlers':('console', 'file'), 'level':'DEBUG'}
In other words, it's not enough to define a handler with level=DEBUG, the actual logging level must also be DEBUG in order to get it to output anything.
share...
Pointers in Python?
... @d.w.: I like this way of thinking about it! "Binding" is a good word. @Ned: The output is the same, yes, but in C the value of "1" is copied to both a and b whereas in Python, they both refer to the same "1" (I think). Thus, if you could change the value of 1 (as with objects), it would b...
LINQ Aggregate algorithm explained
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A picture is worth a thousand words
Reminder:
Func<X, Y, R> is a function with two inputs of type X and Y, that returns a result of type R.
Enumerable.Aggregate has three overloads:
Overload 1:
A Aggregate<A>(IEnumerable<A>...