27 lines
945 B
Markdown
27 lines
945 B
Markdown
---
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title: Converge branching functions
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type: snippet
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tags: [function]
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excerpt: Converges a list of branching functions into a single function and returns the result.
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cover: cherry-trees
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dateModified: 2021-01-08T00:23:44+02:00
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---
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Accepts a converging function and a list of branching functions and returns a function that applies each branching function to the arguments and the results of the branching functions are passed as arguments to the converging function.
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- Use `Array.prototype.map()` and `Function.prototype.apply()` to apply each function to the given arguments.
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- Use the spread operator (`...`) to call `converger` with the results of all other functions.
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```js
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const converge = (converger, fns) => (...args) =>
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converger(...fns.map(fn => fn.apply(null, args)));
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```
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```js
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const average = converge((a, b) => a / b, [
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arr => arr.reduce((a, v) => a + v, 0),
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arr => arr.length
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]);
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average([1, 2, 3, 4, 5, 6, 7]); // 4
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```
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