Lodash _.sortedIndexOf() Method

Lodash _.sortedIndexOf() method is used to get the index of the first occurrence of the particular element in the sorted array. It uses the binary search to sort an array.

Syntax:

_.sortedIndexOf(array, value);

Parameters:

• array: This parameter holds the sorted array.
• value: This parameter holds the value to evaluate.

Return Value:

This method returns the index at which the value should be inserted into the array, other returns -1.

Example 1: In this example, we are getting the index at which we got the given value in the given array.

Javascript

// Requiring the lodash library
const _ = require("lodash");

// Original array
let x = [1, 2, 3, 4, 4, 4, 5, 6, 6]

// Use of _.sortedIndexOf()
// method
let index = _.sortedIndexOf(x, 4);

// Printing the output
console.log(index);

Output:

3

Example 2:In this example, we are getting the index at which we got the given value in the given array.

Javascript

// Requiring the lodash library
const _ = require("lodash");

// Original array
let x = ['a', 'b', 'c', 'd', 'e', 'e', 'e', 'f']

// Use of _.sortedIndexOf()
// method
let index = _.sortedIndexOf(x, 'e');

// Printing the output
console.log(index);

Output:

4

Example 3: In this example, we are getting -1 as the index because the given value is not present in the given array.

Javascript

// Requiring the lodash library
const _ = require("lodash");

// Original array
let x = ['ajax', 'django', 'mongoDb',
    'react', 'reactnative', 'yarn']

// Use of _.sortedIndexOf()
// method
let index = _.sortedIndexOf(x, 'luby');

// Printing the output
console.log(index);

Output:

-1

Note: This will not work in normal JavaScript because it requires the library lodash to be installed.