Conditional Flows

If(condition, validation)

Merge another Validation only when the condition is true.

val := v.
  Is(v.String(username, "username").Not().Blank()).
  If(isAdmin, v.Is(v.String(role, "role").EqualTo("admin")))

Do(func(*Validation))

Run arbitrary logic in the chain.

val := v.
  Is(v.String(username, "username").Not().Blank()).
  Do(func(val *v.Validation) {
    if isAdmin {
      val.Is(v.String(role, "role").EqualTo("admin"))
    }
  })

When(condition, func(*Validation))

Like Do, but gated by a boolean.

val := v.
  Is(v.String(username, "username").Not().Blank()).
  When(isAdmin, func(val *v.Validation) {
    val.Is(v.String(role, "role").EqualTo("admin"))
  })

Validity-gated helpers

These evaluate validity from the current result and conditionally merge/execute:

• IfPathValid, IfAllValid, IfAnyValid, IfValid
• WhenPathValid, WhenAllValid, WhenAnyValid, WhenValid

Use WhenValid when you want to skip costly work if validation already failed.