In JavaScript, console.time and console.timeEnd are powerful tools used for performance measurement. These methods allow developers to measure the time a block of code takes to execute, which is particularly useful for optimizing performance and debugging.

What is console.time?

The console.time is a method used to start a timer. This timer is identified by a unique label which we provide as the parameter to the method. The timer runs until we call the console.timeEnd with the same label.

Syntax:

console.time(label);

Example: The example below shows console.time.

console.time('myTimer');

// Some code whose execution time is to be measured
for (let i = 0; i < 1000000; i++) {

    // Simulate a time-consuming task
}
console.timeEnd('myTimer');

myTimer: 3ms

What is console.timeEnd?

The console.timeEnd is the method used to the stop the timer that was started with the console.time. It also takes the label of the timer as a parameter. When called, it logs the time elapsed since console.time was called with the same label.

Syntax:

console.timeEnd(label);

Example: The example below shows the console.timeEnd

console.time('myTimer');

// Some code whose execution time is to be measured
for (let i = 0; i < 1000000; i++) {

    // Simulate a time-consuming task
}
console.timeEnd('myTimer');

myTimer: 2.562ms

Difference Between console.time and console.timeEnd in JavaScript

The table below shows the difference between console.time and console.timeEnd in JavaScript