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chore: Document map update based on if the key is in the dom of map #6373

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chore: Document map update based on if the key is in the dom of map #6373

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chore: document map update based on if the key is in the dom of map
aosen-xiong Oct 11, 2025
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Merge branch 'master' into map-document
aosen-xiong Oct 21, 2025
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8 changes: 4 additions & 4 deletions docs/DafnyRef/Types.md
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Expand Up @@ -1255,14 +1255,14 @@ is, satisfying `d in m`), maps support the following operations:
`m.Values` | 11 | (i)`set<U>` | the range of `m`
`m.Items` | 11 | (i)`set<(T,U)>`| set of pairs (t,u) in `m`

The expression `t in m` says `t` is in the
domain of `m` and `t !in m` is a syntactic shorthand for
`!(t in m)`.[^fn-map-membership]
`|fm|` denotes the number of mappings in `fm`, that is, the
cardinality of the domain of `fm`. Note that the cardinality operator
is not supported for infinite maps.
Expression `m[d]` returns the `U` value that `m` associates with `d`.
Expression `m[t := u]` is a map like `m`, except that the
element at key `t` is `u`. The expression `t in m` says `t` is in the
domain of `m` and `t !in m` is a syntactic shorthand for
`!(t in m)`.[^fn-map-membership]
Expression `m[t := u]` returns a map like `m`, except that key `t` maps to value `u`. If `t !in m`, the entry will be added; if `t in m`, its value will be updated.

The expressions `m.Keys`, `m.Values`, and `m.Items` return, as sets,
the domain, the range, and the 2-tuples holding the key-value
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