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book: add while and until to the loops section

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crc 2020-01-14 19:14:55 +00:00
parent 8407b50905
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9
doc/RETRO-Book.md
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@ -2469,6 +2469,15 @@ Be careful with recursion as the virtual machine will have a limited
amount of space for the address stack and recursing too many times
can cause a stack overflow.
## Conditional Loops
There are two conditional looping combinators: `while` and `until`.
Both take a quote and execute it, checking a returned flag to decide
when to stop running.
#0 [ dup n:put sp n:inc dup #10 eq? ] until
#10 [ dup n:put sp n:dec dup n:-zero? ] while
## Counted Loops
There are two combinators for counted loops. These are `times` and

9
doc/book/techniques/loops
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@ -27,6 +27,15 @@ Be careful with recursion as the virtual machine will have a limited
amount of space for the address stack and recursing too many times
can cause a stack overflow.
## Conditional Loops
There are two conditional looping combinators: `while` and `until`.
Both take a quote and execute it, checking a returned flag to decide
when to stop running.
#0 [ dup n:put sp n:inc dup #10 eq? ] until
#10 [ dup n:put sp n:dec dup n:-zero? ] while
## Counted Loops
There are two combinators for counted loops. These are `times` and