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randomint_seeded

Available in all subroutines.

Identical to randomint, except takes an additional parameter used to seed the random number generator.

This does not use secure random numbers and should not be used for cryptographic purposes.

This function is not prefixed with the std. namespace.

Example

if (randomint_seeded(0, 99, 555) < 5) {
  set req.http.X-ABTest = "A";
} else {
  set req.http.X-ABTest = "B";
}
if (randomint_seeded(-1, 0, 555) == -1) {
  set req.http.X-ABTest = "A";
} else {
  set req.http.X-ABTest = "B";
}

Try it out

randomint_seeded is used in the following solution recipes, which show real world use cases. Click RUN to provision a Fastly service, execute the code on Fastly, and see how the function behaves.