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Feature #4621
closedNilClass#to_hash
Description
=begin
Various methods defined on NilClass
are handy to avoid Method undefined on NilClass errors. For example,
-
to_a
for multiple dimensioned array when there might not be some values for some indices:array[i].to_a[j].to_a[k]
-
to_s
for pattern match that might fail:string[regex].to_s*2
-
to_i
,to_f
,to_c
for index search that might fail, etc:array.index(element).to_i*3
But there is no NilClass#to_hash
even though there is Hash#to_hash
. If such method existed (equivalent to class NilClass; def to_hash; {} end end
), then we would be able to do:
-
to_hash
for multiple embedded hash when there might not be some values for some keys:hash[:a].to_hash[:b].to_hash[:c]
Is there any reason why to_a
, to_s
, to_i
, to_f
, to_c
are all defined on NilClass
but not for to_hash
? If there is not, I would like to request this feature.
=end
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