What does this line of code means in javascript?

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65545634/what-does-this-line-of-code-means-in-javascript

Answer 1

It means that if n, the argument passed to the function, is falsey, 2000 will be assigned to it.

Here, it's probably to allow callers to have the option of either passing an argument, or to not pass any at all and use 2000 as a default:

function delay(n){
  n = n || 2000
  console.log(n);
} 

delay();
delay(500);