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並前往https://teamtreehouse.com/community/is-there-a-way-to-use-indexof-to-find-an-objects-value-in-an-array

is there a way to use .indexOf to find an object's value in an ...

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex. So for example, this will work. things.

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