大约有 40,000 项符合查询结果（耗时：0.0780秒） [XML]
Python idiom to return first item or None
...
answered Dec 13 '08 at 23:31
jfsjfs
326k132132 gold badges817817 silver badges14381438 bronze badges
...
Ruby Arrays: select(), collect(), and map()
...|
edited Oct 23 '18 at 21:01
SgtPooki
8,87155 gold badges2929 silver badges4040 bronze badges
answered M...
How to return a part of an array in Ruby?
...e out of range.
a = [ "a", "b", "c", "d", "e" ]
a[2] + a[0] + a[1] #=> "cab"
a[6] #=> nil
a[1, 2] #=> [ "b", "c" ]
a[1..3] #=> [ "b", "c", "d" ]
a[4..7] #=> [ "e" ]
...
new DateTime() vs default(DateTime)
...
206
No, they are identical.
default(), for any value type (DateTime is a value type) will always c...
Rails mapping array of hashes onto single hash
...g a method call between each element of it.
For example [1, 2, 3].reduce(0, :+) is like saying 0 + 1 + 2 + 3 and gives 6.
In our case we do something similar, but with the merge function, which merges two hashes.
[{:a => 1}, {:b => 2}, {:c => 3}].reduce({}, :merge)
is {}.merge({:a =&g...
Center/Set Zoom of Map to cover all visible Markers?
...
690
You need to use the fitBounds() method.
var markers = [];//some array
var bounds = new google.m...
Move an item inside a list?
...
answered Jul 3 '10 at 23:15
David ZDavid Z
111k2323 gold badges218218 silver badges256256 bronze badges
...
Fade/dissolve when changing UIImageView's image
...CATransition *transition = [CATransition animation];
transition.duration = 0.25;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;
transition.delegate = self;
[self.view.layer addAnimation:transition forKey:...
RegEx to find two or more consecutive chars
...?
– Alexander Mills
Sep 6 '18 at 21:09
16
Alexander, just to clear few things: {2} means that the...
jQuery show for 5 seconds then hide
...n use .delay() before an animation, like this:
$("#myElem").show().delay(5000).fadeOut();
If it's not an animation, use setTimeout() directly, like this:
$("#myElem").show();
setTimeout(function() { $("#myElem").hide(); }, 5000);
You do the second because .hide() wouldn't normally be on the an...