While or do while logic in expression rule

As others have said you cannot break out of a loop in Appian, you have to let it run to the end of the provided list. Typically what I do is output 'null' when my condition is not met, and the value I do want when the condition is met, and then remove the nulls from the generated list.

Thank you, I will look into that.

Here's trivial example to illustrate the idea:

fn!reject(
  a!isNullOrEmpty,
  a!localVariables(
    local!myList: fn!enumerate(10) + 1,
    a!forEach(
      items: local!myList,
      expression: if(fv!item = 5, fv!item, null)
    )
  )
)

Here's trivial example to illustrate the idea:

fn!reject(
  a!isNullOrEmpty,
  a!localVariables(
    local!myList: fn!enumerate(10) + 1,
    a!forEach(
      items: local!myList,
      expression: if(fv!item = 5, fv!item, null)
    )
  )
)