https://d.puremagic.com/issues/show_bug.cgi?id=12139
Summary: AA.update
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: Phobos
AssignedTo: nob...@puremagic.com
ReportedBy: bearophile_h...@eml.cc
--- Comment #0 from bearophile_h...@eml.cc 2014-02-12 04:26:13 PST ---
This is a possible enhancement. I don't know how much useful it is, but it
seems worth thinking about.
One recent change in the Erlang language is the syntax to handle associative
arrays:
> Updating a map is done as follows:
>
> NewX = X#{ key1 => Val1, ... KeyN := ValN, ...}
X is the old associative array. "=>" adds a new key, while ":=" updates an
already existing key, and if it's not present an error is generated. So a
spelling mistake cannot accidentally introduce a new key if you just want to
update some value. This avoids a common bug.
Similarly a simple "AA.update(key, val)" function in the D object module could
be useful. It's a way to modify associative array values that requires the keys
to be already present. This function modifies the value of a key-value if the
key is present, and raises an exception if the key is missing.
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