Tutorial

console.time() & console.timeEnd() in JavaScript

Published on September 28, 2016
author

Alligator.io

console.time() & console.timeEnd() in JavaScript

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The console object has time() and timeEnd() methods that help with analyzing performance of pieces of your code. You first call console.time() by providing a string argument, then the code that you want to test, then call console.timeEnd() with the same string argument. You’ll then see the time it took to run the code in your browser console. Here’s an example:

console.time("Time this");

for (var i = 0; i < 10000; i++) {
  // Your stuff here
}

console.timeEnd("Time this");

Most of the time code will execute too fast to be able to draw conclusions, so you’d most likely want to run your code in a for loop that goes through thousands of iterations.

Use this only in development mode and remove these calls in code that’s going into production.

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