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Check if class already assigned before adding

In jQuery, is it recommended to check if a class is already assigned to an element before adding that class? Will it even have any effect at all? ...
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Full-screen iframe with a height of 100%

Is iframe height=100% supported in all browsers? 17 Answers 17 ...
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Python Regex - How to Get Positions and Values of Matches

How can I get the start and end positions of all matches using the re module? For example given the pattern r'[a-z]' and the string 'a1b2c3d4' I'd want to get the positions where it finds each letter. Ideally, I'd like to get the text of the match back too. ...
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How can I conditionally require form inputs with AngularJS?

Suppose we're building an address book application (contrived example) with AngularJS. 5 Answers ...
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How to use a custom comparison function in Python 3?

In Python 2.x , I could pass custom function to sorted and .sort functions 6 Answers ...
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How can I determine whether a Java class is abstract by reflection

I am interating through classes in a Jar file and wish to find those which are not abstract. I can solve this by instantiating the classes and trapping InstantiationException but that has a performance hit as some classes have heavy startup. I can't find anything obviously like isAbstract() in the C...
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What do ellipsis […] mean in a list?

I was playing around in python. I used the following code in IDLE: 6 Answers 6 ...
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Active Record - Find records which were created_at before today

...ords where the created_at field is less than today (a date). Is there anything like: 4 Answers ...
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Differences between git pull origin master & git pull origin/master

What is the difference between git pull origin master and git pull origin/master ? 3 Answers ...
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ImportError: no module named win32api

I am using Python 2.7 and I want to use pywin32-214 on Windows 7 . I installed pywin32-214 by using the msi installer. But when I import win32api in my Python script, it throws the error: ...