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@kosich/babel-plugin-partial-expressions-experiment
Advanced tools
Readme
Try it in this babel playground.
Or install it via
npm i @kosich/babel-plugin-partial-expressions-experiment -D
And then add it to your babel.config.json
as described here.
NOTE: put it before pipeline operator plugins, if you use those.
Partial expressions is a syntax sugar to simplify writing expression that are awating one additional variable.
Syntax:
_
is a placeholder for the value~
is used to mark partial expression root and is required whenever we use _
(except for RHS pipes)Examples:
let bang = ~ _ + '!';
// equals to
let bang = x => x + '!';
As a partially applied function:
let bangLog = ~ console.log(_, '!');
// equals to
let bangLog = x => console.log(x, '!');
And as a context of application:
let toBase16 = ~ _.toString(16);
// equals to
let toBase16 = x => x.toString(16);
It is also compatible with the pipeline operator:
I tried to cover a special case for pipes, when _
is in RHS of a pipe. E.g:
let value = 42 |> _ + 1 |> console.log;
// equals to
let value = 42 |> (x => x + 1) |> console.log;
Similarly, we can do partial application:
42 |> console.log(_, '!');
// equals to
42 |> (x => console.log(x, '!'));
And as a context:
42 |> _.toString(16) |> _.toUpperCase();
// equals to
42 |> (x => x.toString(16)) |> (x => x.toUpperCase());
Expression is considered partial if an unbound _
symbol is used in it.
Expression boudaries are limited by following:
2.1 ~
operator
let a = ~ _ + '!'
equals let a = x => x + '!'
2.2 RHS in pipeline operator
42 |> _ + 1 |> console.log
equals 42 |> (x => x + 1) |> console.log
FAQs
Partial expressions experimental babel plugin
The npm package @kosich/babel-plugin-partial-expressions-experiment receives a total of 0 weekly downloads. As such, @kosich/babel-plugin-partial-expressions-experiment popularity was classified as not popular.
We found that @kosich/babel-plugin-partial-expressions-experiment demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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