I did not know this, but it has been sitting in front of my face forever. You can evaluate codeblocks within codeblocks. This is handy when you are building a mechanism to filter records, which typically consists of a long logical AND statement, but you need to insert an OR condition. Metacode example: DATE < today .AND. SALE="GOOD" .AND. (STATE = "TX" OR "CA").

I am processing the records by evaluating them against a series of codeblocks, starting with the most restrictive condition and working my way to the least restrictive condition. As soon as a record fails a test, I discard it and go onto the next record. I put the individual filter conditions into codeblocks and stuff the codeblocks into an array, so that:

for n := 1 to len( aEval )

if .not. eval( aEval[n] )

exit

endif

if n > len( aEval )

// this record is a keeper

What I finally realized is that this is a valid codeblock:

bOrBlock := {|| eval(bBlock1) .or. eval(bBlock2)}

This is the way to insert a logical OR test. The scales have fallen from my eyes.