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more updates to 'do' docs (continuing from PR 10508)

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svn: r16246
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Matthew Flatt 2009-10-05 18:01:17 +00:00
parent a71b7ab998
commit f1a3eaaf6d
1 changed files with 8 additions and 6 deletions
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14
collects/scribblings/reference/for.scrbl
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@ -323,19 +323,21 @@ parallel iterations.}
step-expr])]{ step-expr])]{
Iteratively evaluates the @scheme[expr]s for as long as Iteratively evaluates the @scheme[expr]s for as long as
@scheme[stop-expr?] returns @scheme[#f]. @scheme[stop?-expr] returns @scheme[#f].
To initialize the loop, the @scheme[init-expr]s are evaluated in order To initialize the loop, the @scheme[init-expr]s are evaluated in order
and bound to the corresponding @scheme[id]s. The @scheme[id]s are and bound to the corresponding @scheme[id]s. The @scheme[id]s are
bound in all expressions within the form other than the bound in all expressions within the form other than the
@scheme[init-expr]s. @scheme[init-expr]s.
After the @scheme[id]s are bound, @scheme[stop?-expr] is After the @scheme[id]s are bound, then @scheme[stop?-expr] is
evaluated. If it produces @scheme[#f], each @scheme[expr] is evaluated evaluated. If it produces @scheme[#f], each @scheme[expr] is evaluated
for its side-effect. The @scheme[id]s are then updated with the values for its side-effect. The @scheme[id]s are then effectively updated
of the @scheme[step-expr]s, where the default @scheme[step-expr] for with the values of the @scheme[step-expr]s, where the default
@scheme[id] is just @scheme[id]. Iteration continues by evaluating @scheme[step-expr] for @scheme[id] is just @scheme[id]; more
@scheme[stop?-expr]. precisely, iteration continues with fresh locations for the
@scheme[id]s that are initialized with the values of the corresponding
@scheme[step-expr]s.
When @scheme[stop?-expr] produces a true value, then the When @scheme[stop?-expr] produces a true value, then the
@scheme[finish-expr]s are evaluated in order, and the last one is @scheme[finish-expr]s are evaluated in order, and the last one is