A method of generating random values that are not duplicated...

rand.ts

// if you want better performance, use fpe
// https://gist.github.com/hmmhmmhm/89e200e3501b4d155901baee3cae0f74

const rand = (max) => ~~(Math.random() * max)
const items = []

while(items.length === 100){
  const item = rand(100)
  if(!items.includes(item))
    items.push(item)
}