map-iter

Applies a callback to each value outputted by an iterable.

Installation

Requires Node.js 6.0.0 or above.

npm i map-iter

API

The module exports a single function.

Parameters

1. iter (iterable)
2. cb (function): The callback that, for each value iterated by iter, will be given two arguments: the value iterated, and an incrementing index counter that starts at zero. The return value of cb will be iterated in lieu of the original value.

Return Value

An iterator that outputs the return values of cb.

Example

const map = require('map-iter')
 
const iterator = map([1, 2, 3], x => x * 2)
iterator.next().value // 2
iterator.next().value // 4
iterator.next().value // 6
iterator.next().done // true

Related

• filter-iter: Filters an iterable object so that it only yields values which pass a test function.
• partition-iterable: Divides iterated values into those that match a filter and those that don’t.
• reduce-iterable: Applies a function to iterated values to reduce them to a single value.
• unique-iterable: Filters an iterable object so it doesn’t yield the same value more than once.
• unique-iterable-by: Filters yielded values by testing uniqueness with an index, key, or callback.
• @lamansky/every: Array.prototype.every() for iterables.
• @lamansky/some: Array.prototype.some() for iterables.