LINQ equivalent of foreach for IEnumerable<T>

foreachlinqienumerable
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@selector() in Swift?

swiftselectornstimer
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String concatenation: concat() vs "+" operator

javastringconcatenation
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How do I find the duplicates in a list and create another list with them?

pythonlistduplicates
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Group By Multiple Columns

c#.netgroup-byaggregatelinq
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