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Add method pipe syntax to Dart to allow easy chaining/piping of expressions to in-scope methods #18485

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kevmoo opened this issue Apr 28, 2014 · 4 comments
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Add method pipe syntax to Dart to allow easy chaining/piping of expressions to in-scope methods #18485

kevmoo opened this issue Apr 28, 2014 · 4 comments
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@gbracha
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area-language Dart language related items (some items might be better tracked at github.com/dart-lang/language). closed-duplicate Closed in favor of an existing report type-enhancement A request for a change that isn't a bug

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@kevmoo
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kevmoo commented Apr 28, 2014

Anything of the form

g(f(expression))

Can be written as

expression |> f() |> g()

Basically, the expression on the left side of |> is passed as the first parameter of the function on the right of |>.

What about multiple arguments? Named arguments?

If you had function

int count(int a, int b, int c, {int d}) { ... }

You can call it as

count(1, 2, 3, d: 4);

or

1 |> count(2, 3, d: 4);

The "|>" symbol salad is open for discussion, of course.
@kevmoo
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kevmoo commented Apr 28, 2014

Related blog post with a few examples: http://work.j832.com/2014/04/method-piping-dart-syntax-proposal.html

@gbracha
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gbracha commented Apr 28, 2014

This is not unreasonable. We'll have to discuss it in TC52. I suspect it will be awhile before it makes its way to the top of the agenda. We have smallish matters to propose before this - like async/await perhaps.

Set owner to @gbracha.
Added Accepted label.

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DartBot commented Apr 28, 2014

This comment was originally written by @vicb

relates to https://code.google.com/p/dart/issues/detail?id=16900

@kevmoo
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kevmoo commented Apr 28, 2014

Giving credit to the first person to file this...

Added Duplicate label.
Marked as being merged into #16900.

@kevmoo kevmoo added Type-Enhancement area-language Dart language related items (some items might be better tracked at github.com/dart-lang/language). closed-duplicate Closed in favor of an existing report labels Apr 28, 2014
@kevmoo kevmoo added type-enhancement A request for a change that isn't a bug and removed priority-unassigned labels Mar 1, 2016
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area-language Dart language related items (some items might be better tracked at github.com/dart-lang/language). closed-duplicate Closed in favor of an existing report type-enhancement A request for a change that isn't a bug
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