Forum Discussion

Nimbostratus

Oct 06, 2020

Solved

iRules command: Switch vs If

I saw the article in https://devcentral.f5.com/s/articles/irules-101-04-switch saying Switch is a higher performing command and run faster than If command. Why is that so?

application delivery

iRules

Dario_Garrido

Oct 06, 2020

Yes Morris. That's right.

If-statement with 3 conditions (and default).

if { $bla eq "one" } {
   # do something
} elseif { $bla eq "two" } {
   # do something
} elseif { $bla eq "three" } {
   # do something
} else {
   # do something
}

Switch-statement with 3 conditions (and default).

switch $bla {
  "one" {
    # do something
  }
  "two" {
    # do something
  }
  "three" {
    # do something
  }
  default {
    # do something
  }
}

Don't forget to mark my answer as the best the help me for the contribution.

Regards,

Dario.

morris

Nimbostratus

Oct 06, 2020

hmm, quite interesting article.

So, basically a switch statement with 1 or 2 conditions won't make much difference than if-else statement but more than 5 "switch statement" would be a better choice. Am I understand correctly?

Any example code for a switch statement with 5 conditions?

Dario_Garrido
Noctilucent
Oct 06, 2020
Yes Morris. That's right.
If-statement with 3 conditions (and default).
if { $bla eq "one" } { # do something } elseif { $bla eq "two" } { # do something } elseif { $bla eq "three" } { # do something } else { # do something }
Switch-statement with 3 conditions (and default).
switch $bla { "one" { # do something } "two" { # do something } "three" { # do something } default { # do something } }
Don't forget to mark my answer as the best the help me for the contribution.
Regards,
Dario.
- morris
  Nimbostratus
  Oct 07, 2020
  Thanks!