25 lines
659 B
Markdown
25 lines
659 B
Markdown
---
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title: Transform function arguments
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type: snippet
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language: javascript
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tags: [function]
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cover: flower-shape-sunset
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dateModified: 2020-10-21T21:54:53+03:00
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---
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Creates a function that invokes the provided function with its arguments transformed.
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- Use `Array.prototype.map()` to apply `transforms` to `args` in combination with the spread operator (`...`) to pass the transformed arguments to `fn`.
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```js
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const overArgs = (fn, transforms) =>
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(...args) => fn(...args.map((val, i) => transforms[i](val)));
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```
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```js
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const square = n => n * n;
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const double = n => n * 2;
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const fn = overArgs((x, y) => [x, y], [square, double]);
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fn(9, 3); // [81, 6]
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```
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