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Brad Nelson
2021-01-22 22:43:52 -08:00
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# The many faces of EForth
# 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.
For more information visit:
[https://eforth.appspot.com/](https://eforth.appspot.com/)
## Directories
* reference/ - EForth Reference Material
* ueforth/ - µEforth - EForth refactored to allow source boostraping.
* 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](https://github.com/TG9541/stm8ef/wiki/eForth-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.
* reference/ - EForth Reference Material