I was also considering update_value, but I think put_existing is better.
michalmuskala
josevalim
Creator of Elixir
Qqwy
TypeCheck Core Team
hubertlepicki
bopjesvla
put_in(struct, [Access.key!(:field)], 5) is what put_in(struct, ~a[field], 5) uses under the hood, by the way.
2
Qqwy
TypeCheck Core Team
These changes have been pushed into the Elixir repository. Map.replace/3, Map.replace!/3, Keyword.replace/3 and Keyword.replace!/3 have been added. 
4
hubertlepicki
I have just cycled back to Google → ElixirForum → this issue → oh I was discussing this → Map.replade! works when I already forgot how to do this. 
4
axelson
Scenic Core Team
This was a really interesting discussion (and the PR as well).
For completeness here is a link to the commit where Map.replace/3 and Keyword.replace/3 were deprecated (which means they’re no longer documented and don’t show up if you try to do h Map.replace/3 in iEX).
https://github.com/elixir-lang/elixir/commit/a81a17b3b09b267883383bdb8a00fe00ab2724a8
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mguimas
@josevalim I believe it would had been much nicer if we have added the name Map.put! instead of the verb Map.replace! which has no corresponding function in Map 
0