add-objects

Returns a function that combines two objects using given per-property functions

Small, dependency-free utility for combining two objects.

Install

Requires Node version 6 or above.

npm install --save add-objects

Use

If you know how to use R.evolve you can use this function.

Give an object, where each property is an "adder" or "combinator" function. For example, if we want to concatenate "name" properties, but add "age" properties in the objects we could do the following:

const addObjects = require('add-objects')
const R = require('ramda')
const adder = addObjects({
  name: R.concat,
  age: R.add
})
// combine two objects
const a = {
  name: 'a',
  age: 1
}
const b = {
  name: 'b',
  age: 2
}
adder(a, b)
// {name: "ab", age: 3}

This is very useful when reducing a list of objects for example

// same code as above
const combined = [a, a, b, b].reduce(adder, {name: '', age: 0})
// {name: "aabb", age: 6}

Small print

Author: Gleb Bahmutov <[e-mail]> © 2017

• @bahmutov
• glebbahmutov.com
• blog

License: MIT - do anything with the code, but don't blame me if it does not work.

Support: if you find any problems with this module, email / tweet / open issue on Github

MIT License

Copyright (c) 2017 Gleb Bahmutov <[e-mail]>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.