map-properties

array.map equivalent that also works on Objects and Strings

Install

$ npm install --save map-properties

Usage

var map = require('map-properties');

var mapFn = function(val) {
  return val + val.toUpperCase();
};

map(['a', 'b'], mapFn);
// => ['aA', 'bB']

map({a: 'b', c: 'd'}, mapFn);
// => {a: 'bB', c: 'dD'}

map('ab', mapFn);
// => 'aAbB'

API

mapProperties(source, mapFn[, context[, destination]])

source

required

Type: string|object|array

The source from which to map properties.

mapFn

required

Type: callback(propertyValue, propertyName, source, destination)

A callback that maps the properties to their new values. It is called with the following arguments:

• propertyValue - the value of the property on the source object.
• propertyName - the name (or index) of the property
• source - the source object/array/string from which the properties are being mapped.
• destination - the destination object on to which the properties are being mapped.

context

optional

If provided, will be the this value during execution of mapFn.

destination

optional

Explicitly provide the destination object, otherwise it will be created automatically.

var destination = {};
map(source, mapFn, null, destination);

returns:

destination

License

MIT © James Talmage