On missing key behaviour — on_missing

These generics are used to get or set the behaviour of an hashmap upon query of a missing key (currently, only an hashmap method is implemented).

on_missing_key(x)

on_missing_key(x) <- value

# S3 method for r2r_hashmap
on_missing_key(x)

# S3 method for r2r_hashmap
on_missing_key(x) <- value

Arguments

x	an `hashmap`.
value	a string, either `"throw"` or `"default"`. Action to be taken upon query of a missing key.

a string, either "throw" or "default".

For more details, see the hashtable documentation page.

Valerio Gherardi

m <- hashmap()
on_missing_key(m)
#> [1] "default"
on_missing_key(m) <- "throw"