kelsey.js

Array.from({length: 20}, () => Math.floor(Math.random() * 1000));


// Unique

var arr = []
while(arr.length < 20){
    var randomnumber = Math.ceil(Math.random()*1000)
    if(arr.indexOf(randomnumber) > -1) continue;
    arr[arr.length] = randomnumber;
}
console.log(arr);