Does String cache its 'hash' return value?

[Asfand Yar Qazi]

What I mean is, if I repeatedly call a String's hash method (i.e. like
using it regularly to access a Hash) will the hash value get
recalculated every time?

 

[Florian Frank]

What I mean is, if I repeatedly call a String's hash method (i.e. like
using it regularly to access a Hash) will the hash value get
recalculated every time?

Yes, it will. Have you considered unsing Symbols instead of Strings?
The hash value "calculation" of a Symbol is O(1).

 

[Asfand Yar Qazi]

Yes, it will. Have you considered unsing Symbols instead of Strings?
The hash value "calculation" of a Symbol is O(1).

Depends... if Symbols are used as the keys for a hash table, can they be
as easily accessed from extension modules as if Strings were used?

 

[gabriele renzi]

il Wed, 24 Dec 2003 00:11:27 +0000, Asfand Yar Qazi

Depends... if Symbols are used as the keys for a hash table, can they be
as easily accessed from extension modules as if Strings were used?

why the should'nt ? Many lybraries make use of symbols as constants,
ruby-gtk or Pdf::Writer are examples.. and, btw "everything is an
object" make everything work as everything else

 

[Florian Frank]

Depends... if Symbols are used as the keys for a hash table, can they be
as easily accessed from extension modules as if Strings were used?

You can use ID2SYM(rb_intern("foo")) to get the VALUE of symbol :foo. I
don't think it's too complicated.

 

[nobu.nokada]

Hi,

At Tue, 23 Dec 2003 09:56:53 +0900,

What I mean is, if I repeatedly call a String's hash method (i.e. like
using it regularly to access a Hash) will the hash value get
recalculated every time?

Hash (accurately, st library) has cache, but String doesn't.

 

[Asfand Yar Qazi]

You can use ID2SYM(rb_intern("foo")) to get the VALUE of symbol :foo. I
don't think it's too complicated.

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