How does 一つとして work in this sentence?


> オリバンダーの杖には一つとして同じ杖はない。  
>  No two Ollivander wands are the same.

I'm struggling to parse this sentence.

オリバンダーの杖には同じ杖はない on its own seems to make sense -- "there are no wands
identical to Ollivander's wands". Although I would expect to see と rather than
に so maybe I've got that wrong.

Presumably 一つとして is "considered as a single unit".

Literally, I have "To Ollivanders wands, there are no identical wands when
considered as one", which doesn't make logical sense.

Can this sentence be broken down in a meaningful way? Or else, is there a set
phrase buried in here that I should learn? Could you please give other
examples with a similar structure?




`1 + counter + として (...ない)` is a grammatical pattern that means "(not) even
one". It's a [negative polarity
item](https://japanese.stackexchange.com/a/16060/5010), and is a more emphatic
and literary version of `1 + counter + も (...ない)`.

  * 1人もいない。 There is no one.
  * 1人としていない。 There is not even one person.

See: [JLPT N2 Grammar として～ない (toshite~nai)](https://jlptsensei.com/learn-
japanese-
grammar/%E3%81%A8%E3%81%97%E3%81%A6%EF%BD%9E%E3%81%AA%E3%81%84-toshite-nai-
meaning/)

"～とする" meaning "to consider as ～" has nothing to do with this.




`1 + counter + として (...ない)` is a grammatical pattern that means "(not) even
one". It's a [negative polarity
item](https://japanese.stackexchange.com/a/16060/5010), and is a more emphatic
and literary version of `1 + counter + も (...ない)`.

  * 1人もいない。 There is no one.
  * 1人としていない。 There is not even one person.

See: [JLPT N2 Grammar として～ない (toshite~nai)](https://jlptsensei.com/learn-
japanese-
grammar/%E3%81%A8%E3%81%97%E3%81%A6%EF%BD%9E%E3%81%AA%E3%81%84-toshite-nai-
meaning/)

"～とする" meaning "to consider as ～" has nothing to do with this.

