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'); Â Â const collection = collect([ Â Â Â Â 'neveropen@gmail.com', Â Â Â Â 'aman@gmail.com', Â Â Â Â 'krk@gmail.com', Â Â Â Â 'abc@gfg.com', Â Â Â Â 'demo@gfg.com', Â Â Â Â 'hr@geeksforgeeks.org']); Â Â const counted = collection.countBy( Â Â Â Â email => email.split('@')[1] ); Â Â console.log(counted.all()); |
Output:
{ 'gmail.com': 3, 'gfg.com': 2, 'geeksforgeeks.org': 1 }
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