Leading zeros in a random number generator for a feeder

Gatling (Open-Source)
1

What I am trying to do is to generate a feeder to give me email addresses in the form

testemail_00001@test.com
testemail_00002@test.com
…
testemail_20000@test.com

What I current have is

val feeder=Iterator.continually(Map("email"->("testemail_"+ (Random.nextInt(20000)+"@test.com"))))

That generates in the format

testemail_2324@test.com
testemail_312@test.com

So after looking through scala documentation, that suggests using lpad, but it appears that lpad is not supported in Gatling. So I’m currently got

val feeder=Iterator.continually(Map("email"->("testemail_" + (lpad(Random.nextInt(20000).toString, 5, 0) + "@test.com"))))

Which generates an error about unknown value lpad. Is there a better way of achieving leading zeros with gatling. I haven’t seen anything in the documentation for gatling that seems to deal with leading zeros outside of a println, which I don’ think will work with the above feeder structure.

Many thanks, Ian

2

AFAIK, Scala doesn’t have a built-in lpad, but that’s pretty easy to implement:

def lpad(s: String, len: Int, c: Char): String =
c.toString * (len - s.length) + s

3

Thank you for that - that works perfectly.

Kind regards, Ian

4

I use the following to add leading zero:

`