What is console.log?

Question

What is the use of console.log?

Please explain how to use it in JavaScript, with a code example.

Answer 1

Use console.log to add debugging information to your page.

Many people use alert(hasNinjas) for this purpose but console.log(hasNinjas) is easier to work with. Using an alert pop-ups up a modal dialog box that blocks the user interface.

Edit: I agree with Baptiste Pernet and Jan Hančič that it is a very good idea to check if window.console is defined first so that your code doesn't break if there is no console available.