List Transformations

024_list_transform.cell

// ============================================================================
// 024 — List Transformations
// ============================================================================
// Building new lists from existing ones with for loops.
//
// Run:   soma run 024_list_transform.cell run
// Expect:
//   squares: [1, 4, 9, 16, 25]
//   evens: [2, 4, 6, 8, 10]
//   strings: ["1", "2", "3", "4", "5"]

cell ListTransform {

    on run() {
        let nums = list(1, 2, 3, 4, 5)

        // Map pattern: transform each element
        let squares = list()
        for n in nums {
            squares = list(squares, n * n)
        }
        print("squares: {squares}")

        // Filter pattern: keep only elements matching a condition
        let all_nums = list(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
        let evens = list()
        for n in all_nums {
            if n % 2 == 0 {
                evens = list(evens, n)
            }
        }
        print("evens: {evens}")

        // Convert pattern: transform types
        let strings = list()
        for n in nums {
            let s = to_string(n)
            strings = list(strings, s)
        }
        print("strings: {strings}")

        return "done"
    }
}