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Haskell: Where vs. Let
... State $ \state@(a, b) ->
let
hypot = a^2 + b^2
result = (hypot, state)
in result
f2 :: State Int (Int, Int)
f2 = State f
where
f state@(a, b) = result
where
hypot = a^2 + b^2
result = (hypot, state)
4: When to use let or where is a matte...
What do the crossed style properties in Google Chrome devtools mean?
...
There is now a Filter box at the top of the Styles tab. If you are wondering what has overridden border-color then just type border-color into the Filter. It will show all the rules containing that property, with the property highlighted in y...
Render basic HTML view?
...TML page:
in views/index.jade
include plain.html
in views/plain.html
<!DOCTYPE html>
...
and app.js can still just render jade:
res.render(index)
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How to do error logging in CodeIgniter (PHP)
...
CodeIgniter has some error logging functions built in.
Make your /application/logs folder writable
In /application/config/config.php set $config['log_threshold'] = 1; or use a higher number, depending on how much detail you want in your logs
Use log_message('error', 'So...
Change a column type from Date to DateTime during ROR migration
...ur migration file:
For Rails >= 3.2:
class ChangeDateFormatInMyTable < ActiveRecord::Migration
def up
change_column :my_table, :my_column, :datetime
end
def down
change_column :my_table, :my_column, :date
end
end
...
SQL command to display history of queries
...
(Linux)
Open your Terminal ctrl+alt+t
run the command
cat ~/.mysql_history
you will get all the previous mysql query history enjoy :)
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How can I get the version defined in setup.py (setuptools) in my package?
...dependencies. If your package does not have other dependencies than the builtins, you may be safe; however this isn't a good practice. The reason for that is that it is not future-proof; say tomorrow your code needs to consume some other dependency.
problem #2: where's my __version__ ?
If you hard...
What is the correct way to restore a deleted file from SVN?
...
Use svn merge:
svn merge -c -[rev num that deleted the file] http://<path to repository>
So an example:
svn merge -c -12345 https://svn.mysite.com/svn/repo/project/trunk
^ The negative is important
For TortoiseSVN (I think...)
Right click in Explorer, go to TortoiseSV...
How to iterate through a DataTable
...xecute. If you're using LINQ, you'd write your LINQ Query and get your results that way.
– Justin Niessner
May 7 '16 at 20:03
...
Git submodule push
...tree entry, .gitmodules file )
$ cd your_submodule
$ git checkout master
<hack,edit>
$ git commit -a -m "commit in submodule"
$ git push
$ cd ..
$ git add your_submodule
$ git commit -m "Updated submodule"
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