React Js count Number of lists in a list of lists

React Js count Number of lists in a list of lists:In React.js, to count the number of lists within a list of lists, you can use the filter method with Array.isArray. This code snippet filters the elements in the list, retaining only the sublists (arrays) and then calculates the length of the filtered result. It effectively counts how many sublists are present in the given list of lists, providing you with a count of these nested arrays. This approach leverages the Array.isArray function to identify and count the sublists, making it a concise and efficient way to achieve this task.