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@babel/plugin-proposal-partial-application

非官方测试版翻译

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示例​

（以下示例来自提案）

JavaScript
function add(x, y) { return x + y; }

const addOne = add(1, ?); // apply from the left
addOne(2); // 3

const addTen = add(?, 10); // apply from the right
addTen(2); // 12

let newScore = player.score
  |> add(7, ?)
  |> clamp(0, 100, ?); // shallow stack, the pipe to `clamp` is the same frame as the pipe to `add`.

有效用法​

JavaScript
f(x, ?)           // partial application from left
f(?, x)           // partial application from right
f(?, x, ?)        // partial application for any arg
o.f(x, ?)         // partial application from left
o.f(?, x)         // partial application from right
o.f(?, x, ?)      // partial application for any arg
super.f(?)        // partial application allowed for call on |SuperProperty|

无效用法​

JavaScript
f(x + ?)          // `?` not in top-level Arguments of call
x + ?             // `?` not in top-level Arguments of call
?.f()             // `?` not in top-level Arguments of call
new f(?)          // `?` not supported in `new`
super(?)          // `?` not supported in |SuperCall|

安装​

npm install --save-dev @babel/plugin-proposal-partial-application

用法​

通过配置文件（推荐）​

babel.config.json
{
  "plugins": [
    ["@babel/plugin-proposal-partial-application", { "version": "2018-07" }]
  ]
}

通过 Node API​

JavaScript
require("@babel/core").transformSync("code", {
  plugins: [
    ["@babel/plugin-proposal-partial-application", { version: "2018-07" }]
  ],
});

参考​