MathGroup Archive 2011

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HoldAll/HoldRest

  • To: mathgroup at smc.vnet.net
  • Subject: [mg118485] HoldAll/HoldRest
  • From: "Scot T. Martin" <smartin at seas.harvard.edu>
  • Date: Fri, 29 Apr 2011 07:33:59 -0400 (EDT)

Some kind of issue going on here between the interactions of HoldAll of ValueQ[...] and HoldRest of If[...]. Anyone know the solution so that Out[3] results in True?
=
=
In[1]:= valueQ = If[ValueQ[#], #, False] &
=

=
Out[1]= If[ValueQ[#1], #1, False] &
=

=
In[2]:= x = 5
=

=
Out[2]= 5
=

=
In[3]:= valueQ[5]
=

=
Out[3]= False


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