## reduce Reduces `coll` into a single value using an async `iteratee` to return each successive step. [](https://www.npmjs.com/package/apr-reduce) [](https://www.npmjs.com/package/apr-reduce) **Parameters** - `input` **([Array](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array) \| [Object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object) | Iterable)** - `iteratee` **[Function](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function)** **Examples** ```javascript import reduce from 'apr-reduce'; const sum = await reduce([1, 2, 3], async (sum, item) => new Promise((resolve) => resolve(sum + item)) ); ``` Returns **[Promise](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise)**