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Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala

Why do Scala and frameworks like Spark and Scalding have both reduce and foldLeft ? So then what's the difference between reduce and fold ? ...
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How does deriving work in Haskell?

Algebraic Data Types (ADTs) in Haskell can automatically become instances of some typeclasse s (like Show , Eq ) by deriving from them. ...
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What is the difference between . (dot) and $ (dollar sign)?

... The $ operator is for avoiding parentheses. Anything appearing after it will take precedence over anything that comes before. For example, let's say you've got a line that reads: putStrLn (show (1 + 1)) If you want to get rid of those parentheses, any of the followin...
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Bootstrap throws Uncaught Error: Bootstrap's JavaScript requires jQuery [closed]

I am trying to use Bootstrap to make an interface for a program. I added jQuery 1.11.0 to the <head> tag and thought that was that, but when I launch the web page in a browser jQuery reports an error: ...
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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?

I first noticed in 2009 that GCC (at least on my projects and on my machines) have the tendency to generate noticeably faster code if I optimize for size ( -Os ) instead of speed ( -O2 or -O3 ), and I have been wondering ever since why. ...
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How to calculate a mod b in Python?

Is there a modulo function in the Python math library? 7 Answers 7 ...
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Passing an integer by reference in Python

How can I pass an integer by reference in Python? 11 Answers 11 ...
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Improve subplot size/spacing with many subplots in matplotlib

Very similar to this question but with the difference that my figure can be as large as it needs to be. 6 Answers ...
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How to add a vertical Separator?

I want to add a vertical Separator to a Grid, but i can only find the horizontal. Isn't there a Property, where you can enter if the line of the separator should be horizontal or vertical? ...
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How can I draw vertical text with CSS cross-browser?

I want to rotate a single word of text by 90 degrees, with cross-browser (>= IE6, >= Firefox 2, any version of Chrome, Safari, or Opera) support. How can this be done? ...