8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
19 lines
720 B
Markdown
19 lines
720 B
Markdown
### converge
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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 `coverger` with the results of all other functions.
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```js
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const converge = (converger, fns) => (...args) => 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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