11/1/2023 0 Comments Javascript array findindex![]() ![]() Elements that are appended to the array after the call to findIndex begins will not be visited by callback. The range of elements processed by findIndex is set before the first invocation of callback. ![]() If it is not provided, then undefined is used.įindIndex does not mutate the array on which it is called. If a thisArg parameter is provided to findIndex, it will be used as the this for each invocation of the callback. callback is invoked only for indexes of the array which have assigned values it is not invoked for indexes which have been deleted or which have never been assigned values.Ĭallback is invoked with three arguments: the value of the element, the index of the element, and the Array object being traversed. If such an element is found, findIndex immediately returns the index of that element. The findIndex method executes the callback function once for each element present in the array until it finds one where callback returns a true value. Object to use as this when executing callback. array The array findIndex was called upon. index The index of the current element being processed in the array. Syntax arr.findIndex( callback) Parameters callback Function to execute on each value in the array, taking three arguments:Įlement The current element being processed in the array. See also the find() method, which returns the value of a found element in the array instead of its index. The findIndex() method returns an index in the array, if an element in the array satisfies the provided testing function.
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