大约有 43,000 项符合查询结果（耗时：0.0609秒） [XML]
Array initializing in Scala
...ction, you can write
val list = List(1,2,3,4,5)
val arr = Array[Int](list:_*)
println(arr.mkString)
But usually the toArray method is more handy:
val list = List(1,2,3,4,5)
val arr = list.toArray
println(arr.mkString)
s...
LINQ: Select an object and change some properties without creating a new object
...able, the accepted answer worked for me. Working code for me: var myList = _db.MyObjects.Where(o => o.MyProp == "bar").AsEnumerable().Select(x => { x.SomeProp = "foo"; return x; });
– firepol
Jun 4 '13 at 13:38
...
filter for complete cases in data.frame using dplyr (case-wise deletion)
... %>% filter(complete.cases(.))
or this:
library(tidyr)
df %>% drop_na
If you want to filter based on one variable's missingness, use a conditional:
df %>% filter(!is.na(x1))
or
df %>% drop_na(x1)
Other answers indicate that of the solutions above na.omit is much slower but tha...
Skip callbacks on Factory Girl and Rspec
...ly achieved this using:
FactoryGirl.define do
factory :user do
first_name "Luiz"
last_name "Branco"
#...
after(:build) { |user| user.class.skip_callback(:create, :after, :run_something) }
factory :user_with_run_something do
after(:create) { |user| user.send(:run_someth...
MySQL vs MySQLi when using PHP [closed]
... It's worth noting that things have changed a lot in six years. mysql_*() is now deprecated and will be removed soon. You shouldn't use it for new code.
– user1864610
May 21 '15 at 1:47
...
Redirecting EC2 Elastic Load Balancer from HTTP to HTTPS
... RedirectConfig:
Protocol: HTTPS
StatusCode: HTTP_301
Port: 443
If you still use Classic Load Balancers, go with one of the NGINX configs described by the others.
share
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ASP MVC in IIS 7 results in: HTTP Error 403.14 - Forbidden
...here, question: 403 - Forbidden on basic MVC 3 deploy on iis7.5
Run aspnet_regiis -i. Often I've found you need to do that to get 4.0 apps to work. Open a command prompt as an Administrator (right click the command prompt icon and select Run as Administrator):
cd \
cd Windows\Microsoft.NET\Fram...
Apply style ONLY on IE
...mp; JS hacks beyond IE.
/***** Attribute Hacks ******/
/* IE6 */
#once { _color: blue }
/* IE6, IE7 */
#doce { *color: blue; /* or #color: blue */ }
/* Everything but IE6 */
#diecisiete { color/**/: blue }
/* IE6, IE7, IE8, but also IE9 in some cases :( */
#diecinueve { color: blue\9; }
/* IE7...
In Scala how do I remove duplicates from a list?
...
removeDuplicates(tail.filter(_ != head))
– jwvh
Sep 13 at 22:50
add a comment
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Check that Field Exists with MongoDB
...
Suppose we have a collection like below:
{
"_id":"1234"
"open":"Yes"
"things":{
"paper":1234
"bottle":"Available"
"bottle_count":40
}
}
We want to know if the bottle field is present or not?
Ans:
db.products.f...