The Pipe Operator |>

032_pipe_operator.cell

// ============================================================================
// 032 — The Pipe Operator |>
// ============================================================================
// a |> f(b) is equivalent to f(a, b). Enables readable data pipelines.
//
// Run:   soma run 032_pipe_operator.cell run
// Expect:
//   Top 3 scores:
//     Carol: 95
//     Alice: 90
//     Eve: 88

cell PipeOperator {

    on run() {
        let students = list(
            map("name", "Alice", "score", 90),
            map("name", "Bob", "score", 72),
            map("name", "Carol", "score", 95),
            map("name", "Dave", "score", 60),
            map("name", "Eve", "score", 88)
        )

        // Without pipes (nested calls, hard to read):
        // let result = top(sort_by(filter_by(students, "score", ">", 50), "score", "desc"), 3)

        // With pipes (reads top-to-bottom, like a data flow):
        let result = students
            |> filter_by("score", ">", 50)      // keep scores above 50
            |> sort_by("score", "desc")          // highest first
            |> top(3)                            // take top 3

        print("Top 3 scores:")
        for s in result {
            print("  {s.name}: {s.score}")
        }

        return "done"
    }
}