tracking issue for fallible iterator methods

[nxtlo]

Provides iterator methods for items that are fallible.

This allows for useful patterns like:

def writeln(out: IO[str], content: str) -> Result[None, OsError]:
    # handle io read/write that may fail.
    out.write(content + '\n')
    return Ok(None)

data = Vec(["hi", "mother"])
res = data.iter().try_for_each(lambda x: writeln(sys.stderr, x))
assert res.is_ok() # is ok, unless `writeln` causes an Err.

Public API

class Iterator[Item]:
    def try_for_each[E](self, f: Fn[[Item], Result[None, E]]) -> Result[None, E]: ...
    def try_find(self, f: Fn[[Item], Result[Item, None]]) -> Result[Option[Item], None]: ...
    def try_collect(self) -> Option[MutableSequence[Item]] where self yield Option[Item]: ...

Steps / History

• Implementation: "PR LINK"
• Adjusted documentation
• Tested
• Changelog added

Unresolved Questions