The many faces of EForth

EForth is a delightfully minimalist approach to Forth originated by Bill Muench and Dr. C. H. Ting.

In its original form metacompilation is avoided.

Directories

• reference/ - EForth Reference Material
• circleforth/ - A minimalist Forth modeled after toy Lisps.
• ueforth/ - micro EForth - EForth refactored to allow source boostraping.

EForth Quirks

EForth uses FOR..NEXT in favor of DO..LOOP: FOR/NEXT.

This construct has the odd property that it iterates one "extra" time for zero.

: FOO 10 FOR R@ . NEXT ; FOO
 10 9 8 7 6 5 4 3 2 1 0  ok

To permit a more ordinary loop the AFT word is used in the sequence FOR..AFT..THEN..NEXT.

: FOO 10 FOR ( 1st time only ) AFT R@ . THEN NEXT ; FOO
 9 8 7 6 5 4 3 2 1 0  ok

The even more enigmatic FOR..WHILE..NEXT..ELSE..THEN is used in place of DO..LEAVE..LOOP. It allows a while condition to early out of a counted loop.