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ActiveRecord: size vs count
In Rails, you can find the number of records using both Model.size and Model.count . If you're dealing with more complex queries is there any advantage to using one method over the other? How are they different?
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Objective-C formatting string for boolean?
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Shouldn't the output strings be: "Yes" and "No" :P
– Ben S
Apr 8 '10 at 22:22
131
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Heroku push rejected, no Cedar-supported app detected
...because Heroku is missing some key file that it uses to identify your app (and its type).
php: index.php
python: requirements.txt
ruby: Gemfile # note the capitalization
node: package.json
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UI Terminology: Logon vs Login [closed]
I am crafting an application and cannot decide whether to use the terms Login/out or Logon/off . Is there a more correct option between these two? Should I use something else entirely (like "Sign on/off").
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Python Image Library fails with message “decoder JPEG not available” - PIL
...o be able to process jpegs with pillow (or PIL), so you need to install it and then recompile pillow. It also seems that libjpeg8-dev is needed on Ubuntu 14.04
If you're still using PIL then you should really be using pillow these days though, so first pip uninstall PIL before following these instr...
How to use chrome web inspector to view hover code
... hover code for a button? You will have to hover the mouse over the button and thus cannot use it (mouse) in the inspector. Are there any shortcuts or other ways to accomplish this in the inspector?
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Programmatically creating Markdown tables in R with KnitR
I am just starting to learn about KnitR and the use of Markdown in generating R documents and reports. This looks to be perfect for a lot of the day to day reporting that I have to do with my job. However, one thing that I'm not seeing is an easy way to print data frames and tables using Markdown fo...
Else clause on Python while statement
...as an if/else construct with respect to the condition:
if condition:
handle_true()
else:
handle_false()
is analogous to the looping construct:
while condition:
handle_true()
else:
# condition is false now, handle and go on with the rest of the program
handle_false()
An exam...
Test if a variable is a list or tuple
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Go ahead and use isinstance if you need it. It is somewhat evil, as it excludes custom sequences, iterators, and other things that you might actually need. However, sometimes you need to behave differently if someone, for instance, ...
Check if a value is an object in JavaScript
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UPDATE:
This answer is incomplete and gives misleading results. For example, null is also considered of type object in JavaScript, not to mention several other edge cases. Follow the recommendation below and move on to other "most upvoted (and correct!) answe...