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Fastest way to check if a value exists in a list

What is the fastest way to know if a value exists in a list (a list with millions of values in it) and what its index is? 1...
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Why are arrays covariant but generics are invariant?

From Effective Java by Joshua Bloch, 9 Answers 9 ...
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Why do Python's math.ceil() and math.floor() operations return floats instead of integers?

Can someone explain this (straight from the docs - emphasis mine): 8 Answers 8 ...
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How to dismiss the dialog with click on outside of the dialog?

I have implemented a custom dialog for my application. I want to implement that when the user clicks outside the dialog, the dialog will be dismissed. What do I have to do for this? ...
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JQuery: How to call RESIZE event only once it's FINISHED resizing?

How do I call a function once the browser windows has FINISHED resizing? 8 Answers 8 ...
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Named placeholders in string formatting

In Python, when formatting string, I can fill placeholders by name rather than by position, like that: 19 Answers ...
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What is the equivalent of MATLAB's repmat in NumPy

I would like to execute the equivalent of the following MATLAB code using NumPy: repmat([1; 1], [1 1 1]) . How would I accomplish this? ...
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How to assert two list contain the same elements in Python? [duplicate]

When writing test cases, I often need to assert that two list contain the same elements without regard to their order. 5 An...
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Importance of varchar length in MySQL table

I have a MySQL table where rows are inserted dynamically. Because I can not be certain of the length of strings and do not want them cut off, I make them varchar(200) which is generally much bigger than I need. Is there a big performance hit in giving a varchar field much more length than necessar...
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How can I delete all of my Git stashes at once?

How can I delete all of my Git stashes at once? 7 Answers 7 ...