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    0.2.1 • Public • Published


    Map both mappables (functors) and other variables (non-functors).

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    mapAny is a function that accepts a callback function and a variable to map over. When the variable does not have a .map() method, the callback is called right away, with the variable as first argument. For a variable that implements its own .map() method, that method is called instead.

    The main motivation for mapAny is to have one way to apply a function to objects, when you don't know whether you'll get an array of objects or just an object. The result of this application will not be an array unless the input was an array. This could be accomplished through containers in a functional programming fashion, but mapAny is for cases where you don't use containers.

    The ES6 syntax is used for the callback's signature: function callback(currentValue[, index[, array]]) { // Return new element }. When called with variable without a .map() method, the index will be 0 and the array will have one item, namely the provided variable.

    An example:

    const mapAny = require('map-any')
    const arr = [1, 2, 3, 4, 5]
    const num = 10
    const callback = (x) => x + 1
    mapAny(callback, arr)
    // --> [2, 3, 4, 5, 6]
    mapAny(callback, num)
    // --> 11

    It's curried as well:

    const mapAny = require('map-any')
    const setRunningId = mapAny((x, index) => ({ ...x, id: index}))
    setRunningId([{}, {}, {}])
    // --> [{ id: 0 }, { id: 1 }, { id: 2 }]
    // --> { id: 0 }

    Getting started


    Requires node v8.

    Installing and using

    Install from npm:

    npm install map-any --save

    Running the tests

    The tests can be run with npm test.


    Please read CONTRIBUTING for details on our code of conduct, and the process for submitting pull requests.


    This project is licensed under the ISC License - see the LICENSE file for details.


    npm i map-any

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    • kjellmorten