大约有 1,970 项符合查询结果（耗时：0.0342秒） [XML]
Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
...sion.fetch(:comments, {}).fetch(@comment.id, {})["temp_value"]
From Ruby 2.0, you can do:
@myvar = session[:comments].to_h[@comment.id].to_h["temp_value"]
From Ruby 2.3, you can do:
@myvar = session.dig(:comments, @comment.id, "temp_value")
...
Why can't variable names start with numbers?
...
Well think about this:
int 2d = 42;
double a = 2d;
What is a? 2.0? or 42?
Hint, if you don't get it, d after a number means the number before it is a double literal
share
|
improve th...
Mercurial error: abort no username supplied
...
Having installed "TortoiseHg 2.2 with Mercurial 2.0 - x86 Windows", the Mercurial.RC file can be found under C:\Program Files\TortoiseHg\hgrc.d
– urig
Nov 30 '11 at 7:36
...
Set size on background image with CSS?
...this is the way to do it.
Supported browsers:
Mozilla Firefox 4.0+ (Gecko 2.0+), Microsoft Internet Explorer 9.0+, Opera 10.0+, Safari 4.1+ (webkit 532) and Chrome 3.0+.
.stretch{
/* Will stretch to specified width/height */
background-size: 200px 150px;
}
.stretch-content{
/* Will stretch to wi...
How to debug Angular JavaScript Code
... priority on their list, since they are all heads in on the next AngularJS 2.0 release. Look into the ng-inspect if Batarang is giving you headaches.
– demisx
Nov 6 '14 at 16:08
...
What does the -ObjC linker flag do?
...re using GCC 4.2 as a compiler? Would using LLVM GCC 4.2 or LLVM Compiler 2.0 solve the problem? Or am I mixing up stuff that shouldn't be mixed?
– bsarrazin
Jul 8 '11 at 20:25
...
Return XML from a controller's action in as an ActionResult?
...ument(
new XElement("root",
new XAttribute("version", "2.0"),
new XElement("child", "Hello World!")));
return new XmlActionResult(xml);
}
This reusable, custom ActionResult serialises the XML for you.
public sealed class XmlActionResult : ActionResult
{
pr...
How to download and save a file from Internet using Java?
... that copyURLToFile with timeout parameter is only available since version 2.0 of Commons IO library. See Java docs
– Stanley
Apr 12 '13 at 4:00
...
Android emulator shows nothing except black screen and adb devices shows “device offline”
...
Host GPU needs to be on for me on Ubuntu 12.04 and android sdk 19
– Johan Bjäreholt
Mar 20 '14 at 18:31
2
...
Best way to require all files from a directory in ruby?
...nce or absence of the .rb extension. Tested on MRI 1.8.7-p374, 2.1.5 and 2.2.0 tested. This urban legend comes from Rails, where "clever" autoloading exhibited the behaviour he describes in older versions (and may still exhibit it).
– sheldonh
Feb 25 '15 at 7:3...