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Simplified rearg snippet

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Bruce Feldman
2018-08-12 12:32:39 -04:00
parent 025f4f5534
commit 256f88b277
2 changed files with 3 additions and 15 deletions
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10
snippets/rearg.md
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@ -2,16 +2,10 @@
Creates a function that invokes the provided function with its arguments arranged according to the specified indexes. Creates a function that invokes the provided function with its arguments arranged according to the specified indexes.
Use `Array.reduce()` and `Array.indexOf()` to reorder arguments based on `indexes` in combination with the spread operator (`...`) to pass the transformed arguments to `fn`. Use `Array.map()` to reorder arguments based on `indexes` in combination with the spread operator (`...`) to pass the transformed arguments to `fn`.
```js ```js
const rearg = (fn, indexes) => (...args) => const rearg = (fn, indexes) => (...args) => fn(...indexes.map(idx => args[idx]));
fn(
...args.reduce(
(acc, val, i) => ((acc[indexes.indexOf(i)] = val), acc),
Array.from({ length: indexes.length })
)
);
``` ```
```js ```js

8
test/rearg/rearg.js
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@ -1,8 +1,2 @@
const rearg = (fn, indexes) => (...args) => const rearg = (fn, indexes) => (...args) => fn(...indexes.map(idx => args[idx]));
fn(
...args.reduce(
(acc, val, i) => ((acc[indexes.indexOf(i)] = val), acc),
Array.from({ length: indexes.length })
)
);
module.exports = rearg; module.exports = rearg;