findIndex() Method in JavaScript 🔥 #javascript #DSA #javascriptinterview

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:

- 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.