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What is the difference between .map, .every, and .forEach?
...ve no side effects.
.forEach() returns nothing - It iterates the Array performing a given action for each item in the Array.
Read about these and the many other Array iteration methods at MDN.
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Exclude a sub-directory using find
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How to get the error message from the error code returned by GetLastError()?
...fter a Windows API call, how can I get the last error message in a textual form?
11 Answers
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Unique BooleanField value in Django?
...oose:
@semente: Respects the constraint at the database, model and admin form levels while it overrides Django ORM the least possible. Moreover it can probably be used inside a through table of a ManyToManyField in aunique_together situation. (I will check it and report)
class MyModel(models.Mo...
Why can't overriding methods throw exceptions broader than the overridden method?
...to this rule. You can add an unchecked exception to the throws clause as a form of documentation if you want, but the compiler doesn't enforce anything about it.
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What are attributes in .NET?
...your custom attributes as being sealed classes to improve their runtime performance.
It is also a good idea to consider where it would be appropriate to use place such an attribute, and to attribute your attribute (!) to indicate this via AttributeUsage. The list of available attribute usages migh...
How does “do something OR DIE()” work in PHP?
...pp to access a MySQL database, and on a tutorial, it says something of the form
4 Answers
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Why doesn't C have unsigned floats?
... would be sometimes using an unsigned float and not realizing that your performance has just been killed. If C++ supported it then every floating point operation would need to be checked to see if it is signed or not. And for programs that do millions of floating point operations, this is not acce...
List of special characters for SQL LIKE clause
... sets, such as [a-f]
or [abcdef].Specifier can take two forms:
rangespec1-rangespec2:
rangespec1 indicates the start of a range of characters.
- is a special character, indicating a range.
rangespec2 indic...
“git diff” does nothing
...es, then there is no output.
git diff [--options] [--] […]
This form is to view the changes you made relative to the index (staging area for the next commit). In other words, the differences are what you could tell git to further add to the index but you still haven't.
See the documenta...