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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf

Array.prototype.indexOf() - JavaScript | MDN

The indexOf() method of Array instances returns the first index at which a given element can be found in the array, or -1 if it is not present.



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Array.prototype.indexOf() - JavaScript | MDN

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf

The indexOf() method of Array instances returns the first index at which a given element can be found in the array, or -1 if it is not present.



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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf

Array.prototype.indexOf() - JavaScript | MDN

The indexOf() method of Array instances returns the first index at which a given element can be found in the array, or -1 if it is not present.

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