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Difference between fold and reduce?

Trying to learn F# but got confused when trying to distinguish between fold and reduce . Fold seems to do the same thing but takes an extra parameter. Is there a legitimate reason for these two functions to exist or they are there to accommodate people with different backgrounds? (E.g.: String ...
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How can I get a precise time, for example in milliseconds in Objective-C?

Is there an easy way to get a time very precisely? 11 Answers 11 ...
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How to parse a string into a nullable int

I'm wanting to parse a string into a nullable int in C#. ie. I want to get back either the int value of the string or null if it can't be parsed. ...
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What is the purpose of std::make_pair vs the constructor of std::pair?

What is the purpose of std::make_pair ? 7 Answers 7 ...
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What does '

What does <?= mean exactly? 8 Answers 8 ...
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Difference between classification and clustering in data mining? [closed]

Can someone explain what the difference is between classification and clustering in data mining? 21 Answers ...
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T-SQL get SELECTed value of stored procedure

In T-SQL, this is allowed: 4 Answers 4 ...
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How to get the index of an item in a list in a single step?

How can I find the index of an item in a list without looping through it? 7 Answers 7 ...
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Interface defining a constructor signature?

It's weird that this is the first time I've bumped into this problem, but: 18 Answers ...
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Shell Script — Get all files modified after

I'd rather not do this in PHP so I'm hoping a someone decent at shell scripting can help. 9 Answers ...