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Lodash _.sortedLastIndexOf

Overview

The _.sortedLastIndexOf method in lodash is a convenient utility function that helps to find the index of the last occurrence of a given value in a sorted array. This method is especially useful when working with sorted arrays, as it provides an efficient way to determine the position of an element in the array without the need for a linear search.

The function takes two arguments. The first argument is the array to be searched, and the second argument is the value to search for. The method returns the index of the last occurrence of the given value, or -1 if the value is not found in the array.

Here is the syntax for using the _.sortedLastIndexOf method:

_.sortedLastIndexOf(array, value)
  • array: Required. The sorted array to search.
  • value: Required. The value to search for.

The _.sortedLastIndexOf method uses a binary search algorithm to find the position of the given value in the array. This algorithm is more efficient than a linear search when working with sorted arrays, as it eliminates half the remaining elements in each iteration.

It is important to note that the _.sortedLastIndexOf method assumes that the input array is sorted in ascending order. If the array is not sorted, the method may produce incorrect results. In addition, the method only works with primitive values and does not work with objects or arrays.

In summary, the _.sortedLastIndexOf method is a useful utility function in lodash for finding the index of the last occurrence of a given value in a sorted array. It is an efficient algorithm for working with sorted arrays and can help to improve performance in your code. However, it is important to ensure that the input array is sorted and to use primitive values when calling this method.