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JavaScript check if variable exists (is defined/initialized)
...(Assuming the variable could hold anything (string, int, object, function, etc.))
28 Answers
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Extract hostname name from string
...uld be considered the root domain (i.e. www.食狮.公司.cn, b.c.kobe.jp, etc.). Read more about it here.
Try:
npm install --save psl
Then with my "extractHostname" implementation run:
let psl = require('psl');
let url = 'http://www.youtube.com/watch?v=ClkQA2Lb_iE';
psl.get(extractHostname(url...
Xcode 4.2 debug doesn't symbolicate stack call
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Nothing I tried would fix this (tried both compilers, both debuggers, etc.)
After upgrading XCode for the iOS 5 update, no stack traces seemed to work.
However, I have found an effective work-around - creating my own exception handler (which is also useful for other reasons). First, create a f...
Can not connect to local PostgreSQL
... system, they all contain conf.sample files (pg_hba, pg_ident, pg_service, etc) but no .conf files. This should not be the case, correct? Also the directory that should contain .s.PGSQL.5432 is empty. Instead I have a file located at /private/tmp/.s.PGSQL.5432.lock. PS returns postgres processes so ...
What exactly are DLL files, and how do they work?
...e binary files that can contain executable code and resources like images, etc. Unlike applications, these cannot be directly executed, but an application will load them as and when they are required (or all at once during startup).
Are they important?
Most applications will load the DLL files the...
Get controller and action name from within controller?
For our web application I need to save the order of the fetched and displayed items depending on the view - or to be precise - the controller and action that generated the view (and the user id of course, but that's not the point here).
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Explaining Python's '__enter__' and '__exit__'
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In addition to the above answers to exemplify invocation order, a simple run example
class myclass:
def __init__(self):
print("__init__")
def __enter__(self):
print("__enter__")
def __exit__(self, type, value, traceback):
print("__exit__")
...
Difference between app.use and app.get in express.js
...l of them and regardless of HTTP verb used:
GET /
PUT /foo
POST /foo/bar
etc.
app.get(), on the other hand, is part of Express' application routing and is intended for matching and handling a specific route when requested with the GET HTTP verb:
GET /
And, the equivalent routing for your exa...
AngularJS: Service vs provider vs factory
...those variables/function to ‘service’. We’re simply creating them in order to either use or modify them later.
baseUrl is the base URL that the iTunes API requires
_artist is the artist we wish to lookup
_finalUrl is the final and fully built URL to which we’ll make the call to iTunes
mak...
git remove merge commit from history
...did a soft reset and I've been able to have something quite like I wanted (order do not match initial expectations).
– Benjamin Toueg
Jul 10 '13 at 18:35
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