Collect.js countBy() Method

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The countBy() method is used to count the occurrence of values in the collection. This method counts the occurrence of every element.

Syntax:

collect(array).countBy()

Parameters: The collect() method takes one argument that is converted into the collection and then countBy() method is applied on it.

Return Value: This method returns the count of occurrence of values in the collection.

Below example illustrate the countBy() method in collect.js:

Example 1:

Javascript

// It is used to import collect.js library  
const collect = require('collect.js'); 
  
const num = [0, 1, 1, 2, 3, 4, 4, 5, 5, 5, 5, 5]; 
const data = collect(num); 
  
const total = data.countBy(); 
  
console.log({ total });

Output:

{
 total: Collection {
   items: { '0': 1, '1': 2, '2': 1, '3': 1, '4': 2, '5': 5 }
 }
}

Example 2:

Javascript

const collect = require('collect.js'); 
  
const collection = collect([ 
    'zambiatek@gmail.com', 
    'aman@gmail.com', 
    'krk@gmail.com', 
    'abc@gfg.com', 
    'demo@gfg.com', 
    'hr@zambiatek.com'
]); 
  
const counted = collection.countBy( 
    email => email.split('@')[1] 
); 
  
console.log(counted.all());

Output:

{ 'gmail.com': 3, 'gfg.com': 2, 'zambiatek.com': 1 }

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