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Fastest way to duplicate an array in JavaScript - slice vs. 'for' loop
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There are at least 6 (!) ways to clone an array:
loop
slice
Array.from()
concat
spread operator (FASTEST)
map A.map(function(e){return e;});
There has been a huuuge BENCHMARKS thread, providing following information:
for blink browsers slice() is the fastest method, concat() is a bit slow...
What does passport.session() middleware do?
...e req object and change the 'user' value that is currently the session id (from the client cookie) into the true deserialized user object.
Whilst the other answers make some good points I thought that some more specific detail could be provided.
app.use(passport.session());
is equivalent to
ap...
Post parameter is always null
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Since you have only one parameter, you could try decorating it with the [FromBody] attribute, or change the method to accept a DTO with value as a property, as I suggested here: MVC4 RC WebApi parameter binding
UPDATE: The official ASP.NET site was updated today with an excellent explanation: htt...
Using Regular Expressions to Extract a Value in Java
...hed expression
System.out.println(m.group(1)); // first expression from round brackets (Testing)
System.out.println(m.group(2)); // second one (123)
System.out.println(m.group(3)); // third one (Testing)
}
}
Since you're looking for the first number, you can use such re...
Setting default values for columns in JPA
...ult value.
Note this will serve you if you're only accessing the database from this application. If other applications also use the database, then you should make this check from the database using Cameron's columnDefinition annotation attribute, or some other way.
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how do you filter pandas dataframes by multiple columns
... (df[Year]==2014)]
To store your dataframes in a dict using a for loop:
from collections import defaultdict
dic={}
for g in ['male', 'female']:
dic[g]=defaultdict(dict)
for y in [2013, 2014]:
dic[g][y]=df[(df[Gender]==g) & (df[Year]==y)] #store the DataFrames to a dict of dict
EDIT:...
How do I debug Node.js applications?
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node-inspector could save the day! Use it from any browser supporting WebSocket. Breakpoints, profiler, livecoding, etc... It is really awesome.
Install it with:
npm install -g node-inspector
Then run:
node-debug app.js
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How to convert a Java 8 Stream to an Array?
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If you want to get an array of ints, with values form 1 to 10, from a Stream, there is IntStream at your disposal.
Here we create a Stream with a Stream.of method and convert an Stream to an IntStream using a mapToInt. Then we can call IntStream's toArray method.
Stream<Integer> ...
Git rebase --continue complains even when all merge conflicts have been resolved
...g the conflict, you remove everything in your new patch, keeping only code from the branch you rebased on. Now when you add the file, it will be exactly like the one you tried to rebase on. git status will show no green line displaying the modified files. Now, if you do
git rebase --continue
git ...
Glorified classes in the Java language
Some classes in the standard Java API are treated slightly different from other classes. I'm talking about those classes that couldn't be implemented without special support from the compiler and/or JVM.
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