Wolfram Language & System 11.0 (2016)|Legacy Documentation

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ContainsOnly

ContainsOnly[e1,e2]
yields True if e1 contains only elements that appear in e2.

ContainsOnly[e2]
is an operator form that yields True when the object to which it is applied contains only elements that appear in e2.

ExamplesExamplesopen allclose all

Basic Examples  (2)Basic Examples  (2)

The first list contains only elements in the second list:

In[1]:=
Click for copyable input
Out[1]=

The first list contains elements not present in the second list:

In[1]:=
Click for copyable input
Out[1]=
Introduced in 2015
(10.2)