![]() Once the findIndex() finds such an element, it immediately returns the element’s index. The findIndex() executes the testFn on every element in the array until it finds the one where testFn returns a truthy value, which is a value that coerces to true. ![]() If you omit the thisArg argument, the findIndex() function uses undefined. ![]() The thisArg is an optional object to be used this when executing the callback.
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