Reverse pipeline?

[laggingreflex]

This is regular:

"hello" |> doubleSay |> capitalize |> exclaim

How about reverse pipeline with a new operator: <|

exclaim <| capitalize <| doubleSay <| "hello"

There were previous talks about Elixir-like syntax

// Elixir style
run("hello") |> withThis(10) |> andThis(20)
// is equivalent to
andThis( withThis( run("hello"), 10 ), 20 )

👎 Gives a new semantic meaning to what looks like a normal function call. For example, withThis(10) is no longer just calling that function with one argument
👎 Putting the left-hand side as the first argument to the right-hand side is pretty arbitrary.

With reverse pipline (and additional feature of applying arguments from the right) it could be written as

run("hello") |> withThis <| 10 |> andThis <| 20

When both operators are used in an expression like this, the resverse pipe accepting arguments from the right would apply them _after_ the arguments coming from the regular pipeline from the left.

Regular pipeline takes higher precedence than reverse pipeline.

run("hello") |> withThis <| 10 |> andThis <| 20
____________    ______________
______________________________    _____________

Thoughts?

[Mouvedia]

dupe of #3

[TehShrike]

Closing in favor of #3

[github-actions]

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