大约有 43,100 项符合查询结果（耗时：0.0466秒） [XML]
Array Size (Length) in C#
...
152
If it's a one-dimensional array a,
a.Length
will give the number of elements of a.
If b is...
What does ~~ (“double tilde”) do in Javascript?
...
251
It removes everything after the decimal point because the bitwise operators implicitly convert t...
Getting number of elements in an iterator in Python
...
16 Answers
16
Active
...
How to create enum like type in TypeScript?
...
144
TypeScript 0.9+ has a specification for enums:
enum AnimationType {
BOUNCE,
DROP,
}
...
How do I calculate the normal vector of a line segment?
Suppose I have a line segment going from (x1,y1) to (x2,y2). How do I calculate the normal vector perpendicular to the line?
...
jQuery equivalent of JavaScript's addEventListener method
...
143
Not all browsers support event capturing (for example, Internet Explorer versions less than 9 ...
Regex how to match an optional character
...
Use
[A-Z]?
to make the letter optional. {1} is redundant. (Of course you could also write [A-Z]{0,1} which would mean the same, but that's what the ? is there for.)
You could improve your regex to
^([0-9]{5})+\s+([A-Z]?)\s+([A-Z])([0-9]{3})([0-9]{3})([A-Z]{3})([A-...
How do you create nested dict in Python?
...
313
A nested dict is a dictionary within a dictionary. A very simple thing.
>>> d = {}
&g...
Ruby Regexp group matching, assign variables on 1 line
...
201
You don't want scan for this, as it makes little sense. You can use String#match which will retu...
Gradle, “sourceCompatibility” vs “targetCompatibility”?
...
81
targetCompatibility and sourceCompatibility maps to -target release and -source release in javac...