06 Conditional execution

An if/else statement chooses which block of work to run.

main() {
  Integer score = 82

  if score >= 90 {
    printLine("excellent")
  } else if score >= 60 {
    printLine("passed")
  } else {
    printLine("try again")
  }
}

Output:

passed

Conditions must have type Boolean. Branches are checked in order; the first true branch runs and the others are skipped. This lesson uses if for actions. A later lesson uses if itself as a value.

Try it: Set score to 95, then 40, and identify which branch runs each time.

Precise rules: Language Reference.