A different semantics for WeakMap#get default value

Herby Vojčík herby at mailbox.sk
Tue Jan 17 03:45:27 PST 2012

Brendan Eich wrote:
> Clearly(!) a set-if-not-present method should not be misnamed "get".
> I like the optional sentinel-meaning-not-found for get, and setDefault
> per Python as Tab pointed out. Agree they should not be merged into one
> API. Bikeshedding setDefault at leisure (in background in my head ;-).

getIfAbsentSet(key, dflt)
with dflt being mandatory?
Still there is question of laziness of dflt, the original 
#get:ifAbsentPut: has the block as its second argument.

> /be
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