The "..." is called a spread operator in javascript.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

(In python there is the "*" operator which should be equivalent: [1, 2, *arr].

Array(clicks) instantiate an array of length 'clicks', with its elements undefined.

Then "[...Array(clicks)]" takes the above array instance and spreads it as content in another array.

Seems redundant and they could've just used Array(clicks).