DeleteDuplicates

DeleteDuplicates[list] returns list with the duplicates removed.

Attributes[DeleteDuplicates] := {Protected}

Simple examples

In[1]:= DeleteDuplicates[{b, a, b}]
Out[1]= {b, a}

In[2]:= DeleteDuplicates[foo[b, a, b]]
Out[2]= foo[b, a]

In[3]:= DeleteDuplicates[{}]
Out[3]= {}

In[4]:= Length[DeleteDuplicates[Range[10000]]]
Out[4]= 10000