Create a unique number with javascript time

Question

I need to generate unique id numbers on the fly using javascript. In the past, I\'ve done this by creating a number using time. The number would be made up of the four digi

Answer 1

if you want a unique number after few mili seconds then use Date.now(), if you want to use it inside a for loop then use Date.now() and Math.random() together

unique number inside a for loop

function getUniqueID(){
    for(var i = 0; i< 5; i++)
      console.log(Date.now() + ( (Math.random()*100000).toFixed()))
}
getUniqueID()

output:: all numbers are unique

15598251485988384 155982514859810330 155982514859860737 155982514859882244 155982514859883316

unique number without Math.random()

function getUniqueID(){
        for(var i = 0; i< 5; i++)
          console.log(Date.now())
    }
    getUniqueID()

output:: Numbers are repeated

1559825328327 1559825328327 1559825328327 1559825328328 1559825328328