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Is there a difference between foreach and map?

Ok this is more of a computer science question, than a question based on a particular language, but is there a difference between a map operation and a foreach operation? Or are they simply different names for the same thing? ...
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How to convert CharSequence to String?

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What is __future__ in Python used for and how/when to use it, and how it works

... @zoogleflatt If you are more of a tab guy, you don't know PEP 8. It is strongly recommended to not use tabs... – glglgl Mar 3 '15 at 19:29 ...
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Javascript Equivalent to PHP Explode()

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Hash and salt passwords in C#

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Should image size be defined in the img tag height/width attributes or in CSS? [duplicate]

... have the same effect of sizing the image. Seeing un-styled content may be more common than I think. The only recent browser version that I've been able to see this in is Opera. – Ali Gangji Apr 9 '14 at 14:36 ...
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Thread Safety in Python's dictionary

...bot.org/pyfaq/what-kinds-of-global-value-mutation-are-thread-safe.htm has more details. share | improve this answer | follow | ...
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Whether a variable is undefined [duplicate]

... if (var === undefined) or more precisely if (typeof var === 'undefined') Note the === is used share | improve this answer | ...
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C# nullable string error

...king it complicated. string is already nullable. You don't need to make it more nullable. Take out the ? on the property type. share | improve this answer | follow ...
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How to generate an openSSL key using a passphrase from the command line?

... +1 Great, that works! Thanks, if you can just help a teensy bit more then you get awarded the answer ... why won't this work? openssl rsa -in privkey.pem -pubout -passout pass:foobar -out pubkey.pem – Mawg says reinstate Monica Nov 29 '10 at 7:1...