Pipe Utilities

Utility functions for pipeline debugging and control flow.

Functions

Function	Signature	Description
tap	(T, (T) -> ()) -> T	Call a function for side effects, return value unchanged

Examples

// Debug a pipeline without breaking the chain
let result = orders
  |> Array.filter(.active)
  |> tap(Console.log)         // logs filtered orders, passes them through
  |> Array.map(.total)
  |> Array.reduce((sum, n) -> sum + n, 0)

// Use a closure for custom logging
let processed = data
  |> transform
  |> tap((x) -> Console.log("after transform:", x))
  |> validate

// Works with any type
let name = "  Alice  "
  |> String.trim
  |> tap(Console.log)         // logs "Alice"
  |> String.toUpperCase       // "ALICE"

tap is the pipeline equivalent of a console.log that doesn’t interrupt the flow. The function you pass receives the value but its return is ignored — the original value passes through unchanged.