Listable

Listable is an attribute that calls for functions to automatically map over lists.

Attributes[Listable] := {Protected}

Simple examples

In[1]:= Boole[{True, True, True, False}]
Out[1]= {1, 1, 1, 0}

In[2]:= Positive[{-1, 4, 5}]
Out[2]= {False, True, True}

In[3]:= Positive[{{-1, 4, 5}}]
Out[3]= {{False, True, True}}

In[4]:= Positive[{{-1, 4, 5}, {6, -1}}]
Out[4]= {{False, True, True}, {True, False}}