findIndex() Method in JavaScript 🔥
Full Video - • Arrays - Data Structures and Algorith...
The findIndex() method in JavaScript returns the index of the first element in an array that satisfies a provided testing function. If no element satisfies the testing function, it returns -1.
Syntax:
array.findIndex(callback(element, index, array), thisArg)
callback: A function that tests each element, taking up to three arguments:
element: The current element being processed.
index (optional): The index of the current element.
array (optional): The array that is being traversed.
thisArg (optional): Value to use as this when executing the callback.