Case-insensitive hash?

[Gregory Seidman]

So I understand that a hash can use keys of any type, not just string (or
symbol), but there are occasions when I have a hash that has been populated
with string keys whose values I would like to access case-insensitively. Is
there a setting or something? Do I have to write a wrapper to deal with it?

--Greg

 

[Austin Ziegler]

So I understand that a hash can use keys of any type, not just string (or
symbol), but there are occasions when I have a hash that has been populat= ed
with string keys whose values I would like to access case-insensitively. = Is
there a setting or something? Do I have to write a wrapper to deal with i=

t?

You will need to write a wrapper. Look at HashWithIndifferentAccess in
Rails for an example of how to do this.

-austin

 

[Eero Saynatkari]

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So I understand that a hash can use keys of any type, not just string (or
symbol), but there are occasions when I have a hash that has been populat= ed
with string keys whose values I would like to access case-insensitively. = Is
there a setting or something? Do I have to write a wrapper to deal with i=

t?

If you always access that particular Hash case-insensitively, then
the simplest solution would be to filter input to it:

@hash[key.downcase] =3D value

If, on the other hand, you alter between sensitive and insensitive,
you would filter the output instead=20

# (Naively)
nil unless @hash.keys.find {|k| key.downcase =3D=3D k.downcase}
@hash[key]

If you need to, you could encapsulate this behaviour in a subclass.

--Greg

E

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