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Dashed line border around UIView
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You can set the border with this pattern using Layer and Bezier path like below examples.
Objective-C
CAShapeLayer *yourViewBorder = [CAShapeLayer layer];
yourViewBorder.strokeColor = [UIColor blackColor].CGColor;
yourViewBorder.fi...
What is duck typing?
...h what the object actually was, then our magic trick will work only on pre-set, authorised types - in this case cars, but will fail on other objects which can drive: trucks, mopeds, tuk-tuks etc. It won't work on trucks because our magic wand is expecting it to only work on cars.
In other words, i...
E731 do not assign a lambda expression, use a def
...imple lambda function which I was using twice.
a = map(lambda x : x + offset, simple_list)
b = map(lambda x : x + offset, another_simple_list)
This is just for the representation, I have faced couple of different versions of this.
Now, to keep things DRY, I start to reuse this common lambda.
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Rails hidden field undefined method 'merge' error
...using the non-_tag version, it is assumed that your controller has already set the value for that attribute on the object that backs the form. For example:
controller:
def new
...
@order.service = "test"
...
end</pre>
view:
<%= form_for @order do |f| %>
<%= f.hidden_field...
Equivalent of *Nix 'which' command in PowerShell?
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The very first alias I made once I started customizing my profile in PowerShell was 'which'.
New-Alias which get-command
To add this to your profile, type this:
"`nNew-Alias which get-command" | add-content $profile
The `n at th...
PostgreSQL disable more output
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To disable pagination but retain the output, use:
\pset pager off
To remember this setting, add it to your ~/.psqlrc.
See the psql manual.
On older versions of Pg it was just a toggle, so \pset pager
To completely suppress query output, use \o /dev/null in your psql scri...
SSH Key - Still asking for password and passphrase
...or your username / password.
If you're correctly using SSH when cloning / setting remotes. Then make sure you have a ssh-agent to remember your password. That way, you'll only enter your passphrase once by terminal session.
If it is still too annoying, then simply set a ssh-key without passphrase....
What's the idiomatic syntax for prepending to a short python list?
...ue definitively not entirely Liskov substitutable for list.
>>> set(dir(list)) - set(dir(deque))
{'sort'}
The deque also has an appendleft method (as well as popleft). The deque is a double-ended queue and a doubly-linked list - no matter the length, it always takes the same amount of t...
How can I clear an HTML file input with JavaScript?
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There's 3 ways to clear file input with javascript:
set value property to empty or null.
Works for IE11+ and other modern browsers.
Create an new file input element and replace the old one.
The disadvantage is you will lose event listeners and expando properties.
Reset the ...
Get __name__ of calling function's module in Python
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