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How do I get the number of elements in a list?
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Find the number of nonzero elements
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How do you pick "x" number of unique numbers from a list in Python?
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Why doesn't this array_unique work as expected?
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How do I remove duplicate items from an array in Perl?
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Count occurrences of each element in a List[List[T]] in Scala
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Algorithm: efficient way to remove duplicate integers from an array
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How to Count Duplicates in List with LINQ
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array_unique for objects?
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Java Counting # of occurrences of a word in a string
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Remove redundant or duplicate tuples in Ruby array
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How do I modify an array while I am iterating over it in Ruby?