28 lines
694 B
Markdown
28 lines
694 B
Markdown
---
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title: Rearrange function arguments
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tags: function
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expertise: intermediate
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cover: blog_images/island-corridor.jpg
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firstSeen: 2018-01-28T15:04:21+02:00
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lastUpdated: 2020-10-22T20:24:04+03:00
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---
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Creates a function that invokes the provided function with its arguments arranged according to the specified indexes.
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- Use `Array.prototype.map()` to reorder arguments based on `indexes`.
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- Use the spread operator (`...`) to pass the transformed arguments to `fn`.
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```js
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const rearg = (fn, indexes) => (...args) => fn(...indexes.map(i => args[i]));
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```
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```js
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var rearged = rearg(
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function(a, b, c) {
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return [a, b, c];
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},
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[2, 0, 1]
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);
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rearged('b', 'c', 'a'); // ['a', 'b', 'c']
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```
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