Pipeline operator (tweet)

[ggreif]

Many languages provide a way to chain function calls by invoking methods on the result of the previous call. This is called fluent syntax. In Motoko such a practice would have bad performance characteristics, so we have the pipeline operator instead:

getTable("alumni") |> filter (_, func alumnus = alumnus.year == 2004) |> print(_[0].name)

Here the special binding _ stands for the value originating from the preceding pipeline stage.