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Documentation
Mathematica
Built-in Functions
Programming
Evaluation Control
Unevaluated
Unevaluated[
expr
]
represents the unevaluated form of
expr
when it appears as the argument to a function.
f
[Unevaluated[
expr
]]
effectively works by temporarily setting attributes so that
f
holds its argument unevaluated, then evaluating
f
[
expr
]
.
Example:
Length[Unevaluated[5+6]]
.
See the
Mathematica
book:
Section 2.5.5
.
See also:
Hold
,
HoldFirst
,
ReplacePart
.
Further Examples
The length of this unevaluated expression is 3.
In[1]:=
Out[1]=
This can be seen more clearly from the internal representation of such expressions.
In[2]:=
Out[2]//FullForm=
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