Lodash _.sortedLastIndexOf() Method

The _.sortedLastIndexOf method is used to return the highest index of the array where an element can be inserted and maintain its sorted order. Also, this method is like _.lastIndexOf except that it performs a binary search on a sorted array.
Syntax: 
 

_.sortedLastIndexOf(array, value)

Parameters: This method accepts two parameters as mentioned above and described below:

• array: This parameter holds the array to inspect.
• value: This parameter holds the value to search for.

Return Value: It returns the index of the matched value, else -1.

Example 1: Here, const _ = require(‘lodash’) is used to import the lodash library into the file.

// Requiring the lodash library  
const _ = require("lodash");  
    
// Original array  
let y = [4, 5, 7, 7, 7]   
    
// Use of _.sortedLastIndexOf()  
// method  
let index = _.sortedLastIndexOf(y, 7); 
    
// Printing the output  
console.log(index);

Output: 

4

Example 2: 

// Requiring the lodash library 
const _ = require("lodash"); 
    
// Original array 
let y = ['p', 'q', 'r', 't', 't', 'u', 's', 't' ] 
    
// Use of _.sortedLastIndexOf() 
// method 
let index = _.sortedLastIndexOf(y, 't'); 
    
// Printing the output 
console.log(index);

Output: 
 

7