lodash_fp_memo.js

const filter = require('lodash/fp/filter')
const map = require('lodash/fp/map')
const flow = require('lodash/fp/flow')
const omit = require('lodash/fp/omit')
const trim = require('lodash/fp/trim')
const get = require('lodash/fp/get')
const getOr = require('lodash/fp/getOr')
const has = require('lodash/fp/has')
const transform = require('lodash/fp/transform')

const arr = [1, 2, 3, 4, 5]

console.log(filter((v) => v > 3)(arr))
// => [ 4, 5 ]

console.log(map((v) => v + 1)(arr))
// => [ 2, 3, 4, 5, 6 ]

console.log(
  flow(
    filter((v) => v > 3),
    map((v) => v + 1)
  )(arr)
)
// => [ 5, 6 ]

const obj = {
  red: 'apple',
  blue: 'sky',
  yellow: 'warning',
  green: 'leaf'
}

console.log(omit('blue')(obj))
// => { red: 'apple', yellow: 'warning', green: 'leaf' }

const name = '    mkamakura    '
console.log(trim(name))
// => mkamakura

const nestedObj = {
  hoge: {
    foo: {
      bar: 1
    }
  }
}

console.log(get('hoge.foo.bar')(nestedObj))
// => 1
console.log(get('hoge.foo.bar.aaa')(nestedObj))
// => undefined
console.log(getOr(1)('hoge.foo.bar.aaa')(nestedObj))
// => 1

console.log(has('hoge.foo.bar')(nestedObj))
// => true
console.log(has('hoge.foo.bar.aaa')(nestedObj))
// => false