The first step of SameValue is 1. If Type(x) is different from Type(y), return false.
undefined, null, and number are 3 distinct types so SameValue(null,1) -> false and SameValue(undefined,1) -> false >-----Original Message----- >From: [email protected] [mailto:es-discuss- >[email protected]] On Behalf Of John-David Dalton >Sent: Tuesday, April 28, 2009 11:35 AM >To: [email protected] >Subject: Array.prototype.indexOf use of SameValue() > >In the ECMA 5 RC spec I noticed that 15.4.4.14 Array.prototype.indexOf >(and lastIndexOf) make use of the SameValue operation. >The spec states that (9.12) SameValue will return true If Type(x) is >Undefined or Null. > >Would this not cause an issue with 9c of the Array.prototype.indexOf >spec. >"c. If SameValue(searchElement,elementK) is true, return k.". > >[1,2,null].indexOf(null) -> SameValue(null, 1) -> true, return 0. > >var undef; >[1,2,undef].indexOf(undef) -> SameValue(undefined, 1) -> true, return 0. > >- JDD >_______________________________________________ >es-discuss mailing list >[email protected] >https://mail.mozilla.org/listinfo/es-discuss _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
