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Hm. You seem to be implying that the speed of length varies with the length of the string?

It doesn't vary for strings in the UTF8=0 format, but it does vary for strings in the UTF8=1 format. The length is cached (in a magic annotation) once discovered, though.

>perl -MDevel::Peek -e"utf8::upgrade( $x = "abc" ); Dump($x); length($ +x); Dump($x);" SV = PV(0x7b8d54) at 0x328554 REFCNT = 1 FLAGS = (POK,pPOK,UTF8) PV = 0x7b9fac "abc"\0 [UTF8 "abc"] CUR = 3 LEN = 12 SV = PVMG(0x31e8e4) at 0x328554 REFCNT = 1 FLAGS = (SMG,POK,pPOK,UTF8) IV = 0 NV = 0 PV = 0x7b9fac "abc"\0 [UTF8 "abc"] CUR = 3 LEN = 12 MAGIC = 0x31f17c MG_VIRTUAL = &PL_vtbl_utf8 MG_TYPE = PERL_MAGIC_utf8(w) MG_LEN = 3

In reply to Re^6: Undefined vs empty string by ikegami
in thread Undefined vs empty string by Anonymous Monk

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