Node.js console.count() Method

Last Updated : 26 Jun, 2020

The console.count() method is an inbuilt application programming interface of the console module which is used to count label passed to it as a parameter, by maintaining an internal counter for that specific label.

Syntax:

console.count(label)

Parameters: This method has one parameter as mentioned above and described below:

label: It is an optional parameter specifies the label to be counted. Default value is “default”.

Return Value: This method outputs the count of this function called with the specified label to the stdout.

Below examples illustrate the use of console.count() method in Node.js:

Example 1:

   // Node.js program to demonstrate the    
// console.count() Method 
  
// Accessing console module 
const console = require('console'); 
  
// Calling console.count()  
console.count("a"); 
console.count("b"); 
console.count("a"); 
console.count("a"); 
console.count("a"); 
console.count("b"); 
console.count("b"); 
console.count("b"); 
 
  

Output:

  a: 1  b: 1  a: 2  a: 3  a: 4  b: 2  b: 3  b: 4

Example 2:

   // Node.js program to demonstrate the    
// console.count() Method 
  
// Accessing console module 
const console = require('console'); 
  
// Calling console.count() method 
// with no parameter to count 
// default label 
console.count(); 
console.count("a"); 
console.count("b"); 
console.count("a"); 
console.count("a"); 
console.count(); 
console.count(); 
console.count(); 
console.count("b"); 
 
  

Output:

  default: 1  a: 1  b: 1  a: 2  a: 3  default: 2  default: 3  default: 4  b: 2

Note: The above program will compile and run by using the node filename.js command.

Reference: https://nodejs.org/api/console.html#console_console_count_label

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