Function composition vs pipeline

Naveen Chawla naveen.chwl at
Sat Feb 24 05:31:48 UTC 2018

The function composition operator composes function pipelines into
functions for later use and/or further composition. Those functions still
need to be called via the existing `()` syntax, so it doesn't offer a
different way of calling functions as such.

The function pipeline operator calls the function pipeline immediately, so
it is really only a different way of calling functions.

On Fri, 23 Feb 2018 at 12:37 Jordan Harband <ljharb at> wrote:

> How is either operator not "a different way of calling functions"?
> On Thu, Feb 22, 2018 at 8:34 PM, Naveen Chawla <naveen.chwl at>
> wrote:
>> I was just thinking about the relative merits and coexistence (or not) of
>> function composition operator and function pipeline operator features:
>> e.g.
>> They can of course co-exist, but there is overlap only in the respect
>> that both allow function pipelines to be called from left to right (except
>> the input parameter in the case of the composition feature, which requires
>> existing bracket syntax to be used to call it). If one were to be chosen,
>> would say that a function composition operator adds a whole new dimension
>> of expressive power to the language, whereas a pipeline operator only
>> offers a different way of calling functions.
>> I was wondering about all of your thoughts about whether you'd prefer
>> only the pipeline operator, only the composition operator, or both, or
>> neither to be added to the language (these are pretty much all the
>> possibilities), and why.
>> _______________________________________________
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