// ============================================================================
// 013 — For..In Loops
// ============================================================================
// for..in iterates over List values.
//
// Run:   soma run 013_for_in.cell run
// Expect:
//   Fruits: apple banana cherry
//   Sum of 1..5: 15
//   Names: Alice, Bob, Carol

cell ForLoop {

    on run() {
        // for..in iterates over a list
        let fruits = list("apple", "banana", "cherry")
        let output = ""
        for fruit in fruits {
            output = concat(output, concat(fruit, " "))
        }
        let trimmed = trim(output)
        print("Fruits: {trimmed}")

        // Summing a list of numbers
        let numbers = list(1, 2, 3, 4, 5)
        let sum = 0
        for n in numbers {
            sum = sum + n
        }
        print("Sum of 1..5: {sum}")

        // Building a comma-separated string
        let names = list("Alice", "Bob", "Carol")
        let result = ""
        let count = 0
        for name in names {
            if count > 0 {
                result = concat(result, ", ")
            }
            result = concat(result, name)
            count = count + 1
        }
        print("Names: {result}")

        return "done"
    }
}