count array skipping the unique values
6965
Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
29168
Counting the occurrences / frequency of array elements
128669
How to check whether multiple values exist within an Javascript array
126793
no room for new \count error
113201
How do I check if my array has repeated values inside it?
74036
Count the occurrences of DISTINCT values
140917
Check duplicate property values of objects in NSArray
120958
PHPExcel Sumif and Skip
16003
Copy array by value
152485
Reliably determine the number of elements in an array
27690
Get all unique values in a JavaScript array (remove duplicates)
65271
Find the missing and duplicate elements in an array in linear time and constant space
142030
Remove duplicates from array and save it to another one
96093
How do I get the distinct/unique values in a column in Excel?
103089
Count and use the number of items in advance
87393
Array only adds duplicate values
119728
How to remove all duplicates from an array of objects?