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Change init's role in reduce-like functions: remove "neutral element" restriction and guarantee its use #53871

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Change init's role in reduce-like functions: remove "neutral element" restriction and guarantee its use #53871

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f36ffbb
Add more clarity to `init`'s role in reduce and mapreduce
mbauman Mar 26, 2024
32e762b
fix too many dots......
mbauman Mar 27, 2024
549ceac
Incorporate feedback; define left-most position for init
mbauman Mar 27, 2024
19b76d4
Apply suggestions from code review
mbauman Mar 28, 2024
793a4e0
Add NEWS.md
mbauman Mar 29, 2024
7859c7a
typo fix
mbauman Mar 29, 2024
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2 changes: 1 addition & 1 deletion NEWS.md
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Expand Up @@ -79,7 +79,7 @@ Standard library changes

* The `init` keyword for `reduce` and other reduction functions without guaranteed
associativity (`mapreduce`, `maximum`, `minimum`, `sum`, `prod`, `any`, and `all`)
now provides greater gaurantees on how its value is incorporated into the reduction:
now provides greater guarantees on how its value is incorporated into the reduction:
it is used exactly once as the left-most argument for all non-empty collections,
and it is no longer required to be a "neutral" operand for the reduction.
Previously, its semantics for non-empty collections was explicitly not specified, allowing
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