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How can I trim leading and trailing white space?
...he best way is to handle the trailing white spaces when you read your data file. If you use read.csv or read.table you can set the parameterstrip.white=TRUE.
If you want to clean strings afterwards you could use one of these functions:
# Returns string without leading white space
trim.leading <- ...
How to correctly dismiss a DialogFragment?
... you explicitly created any resources that require manual cleanup (closing files, closing cursors, etc.). Even then, I would override onStop of the DialogFragment rather than onStop of the underlying Dialog.
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What is the correct syntax for 'else if'?
...erent processing for different element tags e.g. an Excel 2007 spreadsheet file is a zip of multiple XML documents, some very complex. You have a separate method for each tag. You dispatch via a dictionary. Nothing to be scared of. If the method for handling <foo> is do_foo, you can even build...
Can I query MongoDB ObjectId by date?
... Very handy .. FYI, you can save this function in your ~/.mongorc.js file to have it available when the mongo shell starts up.
– Stennie
Nov 27 '12 at 23:14
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What is middleware exactly?
...lowing chief HTTP middleware components.
Exception/error handling
Static file server
Authentication
MVC
As shown in the above diagram, there are various middleware components in ASP.NET which receive the incoming request, and redirect it to a C# class (in this case a controller class).
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Sum a list of numbers in Python
...gt; a = range(10)
>>> sum(a)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable
>>> del sum
>>> sum(a)
45
It seems that sum has been defined in the code somewhere and overwrites the default functio...
Getting Django admin url for an object
...erseMatch errors.
Turns out I had the old format admin urls in my urls.py file.
I had this in my urlpatterns:
(r'^admin/(.*)', admin.site.root),
which gets the admin screens working but is the deprecated way of doing it. I needed to change it to this:
(r'^admin/', include(admin.site.urls) ),
...
Change from SQLite to PostgreSQL in a fresh Rails project
... -Of3 -Eutf8 f3_development
$ createdb -Of3 -Eutf8 f3_test
Update the Gemfile
gem 'sqlite3'
gem 'pg'
gem 'taps'
$ bundle
Update database.yml
#development:
# adapter: sqlite3
# database: db/development.sqlite3
# pool: 5
# timeout: 5000
development:
adapter: postgresql
encoding: unicode...
PHP 5.4 Call-time pass-by-reference - Easy fix available?
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just use phpcs, will dig up every file that has this for you.
– Thomas Cheng
Feb 16 at 17:48
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The property 'value' does not exist on value of type 'HTMLElement'
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The reason is because in tsx files you cannot use the <> operators to cast, since these are used in React. So you have to use as: basarat.gitbooks.io/typescript/docs/types/…
– Powderham
Apr 1 '19 at 15:41
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