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Dynamically adding properties to an ExpandoObject

I would like to dynamically add properties to a ExpandoObject at runtime. So for example to add a string property call NewProp I would like to write something like ...
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Capture key press (or keydown) event on DIV element

How do you trap the keypress or key down event on a DIV element (using jQuery)? 3 Answers ...
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Find if current time falls in a time range

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How do I create a class instance from a string name in ruby?

I have the name of a class and I want to create an instance of that class so that I can loop through each rails attribute that is present in the schema of that class. ...
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Selecting multiple columns in a pandas dataframe

I have data in different columns but I don't know how to extract it to save it in another variable. 18 Answers ...
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Is there an “exists” function for jQuery?

How can I check the existence of an element in jQuery? 43 Answers 43 ...
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Properly escape a double quote in CSV

I have a line like this in my CSV: 4 Answers 4 ...
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NSInvocation for Dummies?

How exactly does NSInvocation work? Is there a good introduction? 4 Answers 4 ...
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creating a random number using MYSQL

I would like to know is there a way to select randomly generated number between 100 and 500 along with a select query. 6 A...
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Differences in boolean operators: & vs && and | vs ||

I know the rules for && and || but what are & and | ? Please explain these to me with an example. 11 Ans...