How to remove this error, please help

Question

Error in java script
https://code.sololearn.com/Wzo2RtltCrh6/?ref=app

Answer 1

I see the problem: "pickRandom" is not a built-in function in JavaScript. You should implement it yourself.

Answer 2

That function cann be for example:

function pickRandom(x){
return x[Math.floor(Math.random() * x.length)];
}

Answer 3

Thank you very much, actually I learnt it from Google Grasshopper