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30-seconds-of-code/snippets/collectInto.md
2020-09-15 21:52:00 +03:00

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---
title: collectInto
tags: function,array,intermediate
---
Changes a function that accepts an array into a variadic function.
- Given a function, return a closure that collects all inputs into an array-accepting function.
```js
const collectInto = fn => (...args) => fn(args);
```
```js
const Pall = collectInto(Promise.all.bind(Promise));
let p1 = Promise.resolve(1);
let p2 = Promise.resolve(2);
let p3 = new Promise(resolve => setTimeout(resolve, 2000, 3));
Pall(p1, p2, p3).then(console.log); // [1, 2, 3] (after about 2 seconds)
```