map-filter-reduce

MojiScript Map/Filter/Reduce

MojiScript Map/Filter/Reduce example.

You could also use map, filter, reduce from Sanctuary or Ramda or lodash/fp or any other library.

Install

# clone repository
git clone https://github.com/joelnet/MojiScript.git

# enter directory
cd MojiScript/examples/map-filter-reduce

# install dependencies
npm ci

Run

npm start

You should see the output

8

Unit Tests

Basic test run

npm test

Tests with coverage

npm test -- --coverage

Tests are written in JavaScript using Jest and should follow Jest best practices.

Source

index.js

import log from 'mojiscript/console/log'
import run from 'mojiscript/core/run'
import main from './main'

const dependencies = {
  log
}
const state = [ 1, 2, 3 ]

run ({ dependencies, state, main }) // => 8

main.js

import pipe from 'mojiscript/core/pipe'
import filter from 'mojiscript/list/filter'
import map from 'mojiscript/list/map'
import reduce from 'mojiscript/list/reduce'
import { add, double, isOdd } from './lib/math'

// main :: Dependencies -> [Number] -> Number
const main = ({ log }) =>  pipe ([
  filter (isOdd),   // [1, 2, 3] => [1, 3]
  map (double),     // [1, 3]    => [2, 6]
  reduce (add) (0), // [2, 6]    => 8,
  log
])

export default main