Includes() in Javascript

Question

Includes() method isn't working in the SoloLearn playground editor. Maybe the problem is in javascript version which SoloLearn use?

Answer 1

There's no such keyword, operator in javascript. There's analogue - import. Maybe this one in js language?

Answer 2

I apologise for misunderstanding.
I was thinking of a method called 'includes()'. I edited my question in order to avoid misunderstanding.
https://www.w3schools.com/jsref/jsref_includes.asp