Map a day of the week to 'weekday' or 'weekend' using a switch with multiple case values.

Comma-separated values on one case line, no fallthrough by design:

  case "Monday", "Tuesday", "Wednesday", "Thursday", "Friday"
    category: "Weekday"
  case "Saturday", "Sunday"
    category: "Weekend"

Multiple case values replace the need for fallthrough entirely. See Q237.

Example

defines module qa.controlflow.switchmultiplecases

  defines program

    SwitchMultipleCasesDemo()
      stdout <- Stdout()

      days <- ["Monday", "Saturday", "Wednesday", "Sunday"]

      for day in days
        category <- "Unknown"
        switch day
          case "Monday", "Tuesday", "Wednesday", "Thursday", "Friday"
            category: "Weekday"
          case "Saturday", "Sunday"
            category: "Weekend"
          default
            category: "Unknown"
        stdout.println(`${day}: ${category}`)

Common mistakes

E01010 — EK9 has no fallthrough and no colons after case. List multiple values with commas on one case line.

Incorrect:

      case "Monday":
      case "Tuesday":
      case "Wednesday":

Correct:

      case "Monday", "Tuesday", "Wednesday"

Other ways to ask this

I need a switch that groups several values into one case — no fallthrough needed
In Java I'd use switch with fallthrough for grouping. Write the EK9 multi-value case
Given a day name, categorise it using multiple values in a single case line
Handle Monday through Friday in one case and Saturday/Sunday in another

Coming from another language?

Java: case "Mon": case "Tue": (fallthrough). C#: case "Mon": case "Tue": (fallthrough). EK9: case "Monday", "Tuesday" — comma-separated, no fallthrough.

Keywords: values, group, case, switch, weekday, weekend, multiple