Identity¶

Status: Stable

documented, exercised by the test suite and/or worked examples, with no known limitations recorded.

Description¶

Identity[expr] gives expr unchanged (the identity function).

All examples below are verified against the current Mathilda build.

In[1]:= Identity[x]
Out[1]= x

In[2]:= Identity[1 + 2]
Out[2]= 3

In[3]:= Map[Identity, {a, b, c}]
Out[3]= {a, b, c}

builtin_identity (src/core.c) is the one-argument identity: it returns a copy of its single argument unchanged, or NULL for any other arity.

Attributes: Protected.

Stable — documented, exercised by the test suite and/or worked examples, with no known limitations recorded.