Currently, for-loops admit a "where" clause:
for x in seq *where* cond {
...
}
behaves like
for x in seq {
if !cond { continue }
...
}
I'd be interested in a "while" clause:
for x in seq *while* cond {
...
}
would behave like
for x in seq {
if !cond { break }
...
}
This is one area where C-style for-loops would have provided a clean
solution (combining multiple conditions with &&), but once they're removed
any extra conditions will have to move inside the loop.
Pros:
- It's a simple way to express a common piece of control flow that
otherwise requires negation and another set of braces.
- Its meaning is easy to understand.
Cons:
- It's a new feature.
- Naming might cause confusion with while-loops.
Open questions:
- How/could it be combined with "where" clauses? Would order matter?
- Does anyone else care?
Thanks,
Jacob
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