Hmmm, even outside the indexOf() question, this is a bit creepy to me.
I hadn't previously tested, but these are all true, at least in
Firefox 3.5 and IE8:
"mpg" === "mpg"
"mpg" !== new String("mpg")
new String("mpg") !== new String("mpg")
new String("mpg") != new String("mpg")
new Number(1) == 1
new Number(1) !== 1
new Number(1) != new Number(1)
[] != []
new Array() != new Array()
new Array() != []
new Object() != {}
Is it an identity test -- is it the same actual object? -- maybe
coupled with the way various types of data are stored internally? It
looks like once the string "mpg" has been created, another literal
"msg" is the same, but a new String object containing the same literal
is not. The analogous tests with Number, Array, and Object values
indicate somewhat different behavior, but since it's consistent across
IE and Firefox, it seems inherent in the language.
Can anyone explain, not *how* this actually works, but the logic
behind it?
Thanks,
e
On Sep 2, 4:28 am, "T.J. Crowder" <t...@crowdersoftware.com> wrote:
> You're probably running into equality vs. identity (loose equality vs.
> strict equality).
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