log

Logs the current data to the console at the point it appears in .flow(). Useful for debugging.

Signature

log(prefix?)

Parameters

Debug pass-through: logs each row (optionally under prefix) and forwards it unchanged.

Option	Type	Default	Description
prefix	string		Console prefix string.

Example

.flow(
  spread({ by: "category",  dir: "x" }),
  log("after spread"),   // logs each group
  derive(d => d)
)