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Lodash _.sortedUniq()Method - GeeksforGeeks

Last Updated : 15 Jul, 2025

Lodash _.sortedUniq method is used to return the lowest index of the array where an element can be inserted and maintain its sorted order. Also, this method is like _.uniq except that it's designed and optimized for sorted arrays. In _.uniq only the first occurrence of each element is kept and the order of result values is determined by the order they occur in the array.

_.sortedUniq(array);

• This method is used to return the new duplicate free array.

Example 1: In this example, we are getting a unique array by the use of the lodash _.sortedUniq() method.

// Requiring the lodash library 
const _ = require("lodash"); 
    
// Original array 
let y = ([1, 1, 2, 3, 3, 4]);
    
// Use of  _.sortedUniq() 
// method 
let index =  _.sortedUniq(y, [1, 1, 2]); 
    
// Printing the output 
console.log(index);

Output: 

[ 1, 2, 3, 4 ]

Example 2: In this example, we are getting a unique array of characters by the use of the lodash _.sortedUniq() method.

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

Output:

['p', 'q', 'r', 't', 'u', 's', 't', 'v', 'w']

Example 3: In this example, we are getting a unique array of strings by the use of the lodash _.sortedUniq() method.

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

// Original array 
let y = (['chemistry', 'computer', 'computer',

    'english', 'geography', 'hindi', 'hindi',

    'maths', 'physics']);

// Use of  _.sortedUniq() 
// method 
let index = _.sortedUniq(y);

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

Output:

['chemistry', 'computer', 'english', 
'geography', 'hindi', 'maths', 'physics']

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

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