HoldAll/HoldRest // updated
- To: mathgroup at smc.vnet.net
- Subject: [mg118489] HoldAll/HoldRest // updated
- From: "Scot T. Martin" <smartin at seas.harvard.edu>
- Date: Fri, 29 Apr 2011 07:34:42 -0400 (EDT)
Fixing small but important typos from email of a few minutes ago.... and re-posting: Some kind of issue going on here between the interactions of HoldAll and HoldRest of ValueQ[...], If[...], and Function[...]. Anyone know the solution so that Out[3] results in 5? In[1]:= valueQ = If[ValueQ[#], #, False] & Out[1]= If[ValueQ[#1], #1, False] & In[2]:= x = 5 Out[2]= 5 In[3]:= valueQ[x] Out[3]= False In[4]:= If[ValueQ[x], x, False] Out[4]= 5