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March 16, 2019
9:38 a.m.
On Sat, Mar 16, 2019 at 09:04:22PM +1300, Greg Ewing wrote:
Another random thought about this: Mathematicians use addition as a metaphor for quite a range of different things, but they tend to only use the symbols ∪ and ∩ for actual sets, or things that are very set-like. So maybe that's an argument for using '+' rather than '|' for dict merging.
If one views an ordered dict as an assoc list, '+' would mean prepending the new values to the existing ones. If one views an unordered dict as a set of ordered pairs, '|' would make sense. Stefan Krah