#119 The findIndex Method

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The findIndex() method, Array.prototype.findIndex(), Searching arrays by index, Finding the first matching element's index, Callback function in findIndex(), Returning index based on conditions, Accessing object properties, Finding index of objects in arrays, Handling -1 (not found), Comparing findIndex() with find(), Performance considerations, Using findIndex() with multiple criteria, Removing elements by index, Updating elements by index, Chaining findIndex() with other methods, Real-world use cases for findIndex(), Handling sparse arrays, Immutable operations, JavaScript ES6 features, Simplifying search operations.

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