Collect.js countBy() Method

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:

Output:

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

Example 2:

Output:

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