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How to use range-based for() loop with std::map?
...ured bindings, which allows for the following:
std::map< foo, bar > testing = { /*...blah...*/ };
for ( const auto& [ k, v ] : testing )
{
std::cout << k << "=" << v << "\n";
}
share
...
How do you know a variable type in java?
...s very bad , So code...)
How to get variable's type?
Up's :
String str = "test";
String type = str.getClass().getName();
value: type = java.lang.String
this method :
str.getClass().getSimpleName();
value:String
now example:
Object o = 1;
o.getClass().getSimpleName();
value:Integer
...
Choosing between MEF and MAF (System.AddIn)
...ll directory and the application sees it and runs it. It also facilitates testing. You can instantiate the object you want to test and feed it mock objects for all its dependencies, but when it runs as a composed application, the composition process automatically hooks all the real objects togethe...
What's Alternative to Singleton
...the singleton. We did see some benefits of not using singleton in the unit testing because we can test different configurations all at once.
...
How to check if running in Cygwin, Mac or Linux?
...GW64_NT" ]; then
# Do something under 64 bits Windows NT platform
fi
Testing
Linux (Ubuntu 12.04 LTS, Kernel 3.2.0) tested OK.
OS X (10.6.8 Snow Leopard) tested OK.
Windows (Windows 7 64 bit) tested OK.
What I learned
Check for both opening and closing quotes.
Check for missing parenthes...
how to permit an array with strong parameters
...me, DateTime, StringIO, IO,
ActionDispatch::Http::UploadedFile and Rack::Test::UploadedFile.
To declare that the value in params must be an array of permitted scalar values map the key to an empty array:
params.permit(:id => [])
In my app, the category_ids are passed to the create acti...
Convert Enum to String
...d by the string in the compiled result, which in turn means this is the fastest way possible.
Any use of enum names does interfere with code obfuscation, if you consider obfuscation of enum names to be worthwhile or important - that's probably a whole other question.
...
jQuery first child of “this”
...
I've added jsperf test to see the speed difference for different approaches to get the first child (total 1000+ children)
given, notif = $('#foo')
jQuery ways:
$(":first-child", notif) - 4,304 ops/sec - fastest
notif.children(":first") - 653 ...
Progress indicator during pandas operations
... internally..
here's the code from my gist (I'll add more pandas function tests there):
import pandas as pd
import numpy as np
import multiprocessing
from functools import partial
def _df_split(tup_arg, **kwargs):
split_ind, df_split, df_f_name = tup_arg
return (split_ind, getattr(df_spli...
How to remove spaces from a string using JavaScript?
...
SHORTEST and FASTEST: str.replace(/ /g, '');
Benchmark:
Here my results - (2018.07.13) MacOs High Sierra 10.13.3 on Chrome 67.0.3396 (64-bit), Safari 11.0.3 (13604.5.6), Firefox 59.0.2 (64-bit) ):
SHORT strings
Short string simi...