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Lodash _.frequencies() Method

  • Last Updated : 30 Sep, 2020

The Lodash _.frequencies() method takes an array and returns a mapping object whose keys are the values of the array’s elements and values are counts of that key appeared in that array.

Syntax:

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_.frequencies( array );

Parameters: This method accepts a single parameter as mentioned above and described below:

  • array: The given array from which mapping is to be created.

Return Value: This method returns a created mapping object.



Note: This will not work in normal JavaScript because it requires the lodash.js contrib library to be installed. Lodash.js contrib library can be installed using the following command:

npm install lodash-contrib

Example 1:




// Defining underscore lodash variable 
var _ = require('lodash-contrib'); 
  
// Array 
var array = ["Geeks", "Geeks", "GFG",  
             "Computer_Science_Portal",  
             "Geeks", "GFG"]; 
    
var obj = _.frequencies(array); 
  
// Printing object
console.log("Original Array : ", array); 
console.log("Frequency of elements : ", obj);

Output:

Original Array : [“Geeks”, “Geeks”, “GFG”, “Computer_Science_Portal”, “Geeks”, “GFG”]
Frequency of elements : Object {Computer_Science_Portal: 1, GFG: 2, Geeks: 3}

Example 2:




// Defining underscore lodash variable 
var _ = require('lodash-contrib'); 
  
// Array 
var array = []; 
    
var obj = _.frequencies(array); 
  
// Printing object
console.log("Original Array : ", array); 
console.log("Frequency of elements : ", obj);

Output:

Original Array : []
Frequency of elements : Object {}

Example 3:




// Defining underscore lodash variable 
var _ = require('lodash-contrib'); 
  
// Array 
var array = [1, 1, 1, 1, 1, 1, 3,
          3, 3, 4, 4, 4, 5, 5, 5, 
          6, 6, 6, 6, 7, 7, 8, 10]; 
    
var obj = _.frequencies(array); 
  
// Printing array
console.log("Original Array : ", array); 
console.log("Frequency of elements : ", obj);

Output:

Original Array : [1, 1, 1, 1, 1, 1, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 7, 8, 10]
Frequency of elements : Object {1: 6, 3: 3, 4: 3, 5: 3, 6: 4, 7: 2, 8: 1, 10: 1}




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