What is console.count() useful for?

What is console.count() useful for?

There are times when we really need information about how many times a component has redrawn. In this article, we will learn how to use console.count() to keep track of the number of calls and how it can be useful during application development.

What is console.count()?

console.count() is a built-in method of the console object in JavaScript that allows us to keep track of how many times it has been called at a given point in our code. When we use console.count(), JavaScript automatically increments the counter for a given key and displays the number of calls in the console.

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How to use console.count()?

The syntax of the console.count() function is simple:


label is an optional argument that allows us to provide a name for our counter. If we specify this argument, console.count() will keep track of the number of calls for a given label. If we do not specify a label, console.count() will keep track of the number of calls for the entire file or for the particular context in which it is called.

Usage Examples console.count():

  1. Tracking Functions:
function someFunction() {
    console.count('Wywołanie funkcji');

someFunction(); // Wywołanie funkcji: 1
someFunction(); // Wywołanie funkcji: 2
  1. Tracking the Loop:
for (let i = 0; i < 3; i++) {
    console.count('Pętla for');

// Pętla for: 1
// Pętla for: 2
// Pętla for: 3

Why is console.count() useful?

  1. Tracking Function Calls:
    Using console.count(), we can easily keep track of how many times our function has been called. This is useful for optimizing code and eliminating unnecessary calls.
  2. Loop Optimization:
    For loops, we can check how many times a loop has been executed. If the number is unexpected or too high, we can rethink our algorithm.
  3. Debugging Complicated Applications:
    In large projects where multiple code fragments may call a single function, console.count() allows us to find the exact source of the problem.
  4. Improving Performance:
    Tracking the number of calls can help identify pieces of code that need to be optimized, leading to better application performance.


The console.count() function is a great tool for understanding how our code actually works. It allows us to accurately track function and loop calls, which is crucial for optimizing and debugging our programs. Without a doubt, knowledge of this tool will make it easier for any programmer to analyze and improve his JavaScript code.