Function clearObject

utils__tests__objects.js

import { clearObject } from 'utils_objects'

describe('clearObject()', () => {

  test('clearObject({ x: 1, y: 2, z: 0, r: null }) should return { x: 1, y: 2, z: 0 }', () => {
    expect(clearObject({ x: 1, y: 2, z: 0, r: null })).toEqual({ x: 1, y: 2, z: 0 })
  })

  test('clearObject({ reciever: { id: 1, comment: null } }) should return { reciever: { id: 1 } }', () => {
    expect(clearObject({ reciever: { id: 1, comment: null } })).toEqual({ reciever: { id: 1 } })
  })

  test('clearObject({ reciever: { id: 1, comment: "123" } }) should return { reciever: { id: 1, comment: "123" } }', () => {
    expect(clearObject({ reciever: { id: 1, comment: "123" } })).toEqual({ reciever: { id: 1, comment: "123" } })
  })

  test('clearObject({ reciever: { id: 1, comment: "" } }) should return { reciever: { id: 1 } }', () => {
    expect(clearObject({ reciever: { id: 1, comment: "" } })).toEqual({ reciever: { id: 1 } })
  })

  test('clearObject([1,2,3]) should return [1,2,3]', () => {
    expect(clearObject([1,2,3])).toEqual([1,2,3])
  })

  test('clearObject({ items: [{ id: 1 }, { id: 2 }, { id: 3 } ] }) should return { items: [{ id: 1 }, { id: 2 }, { id: 3 } ] }', () => {
    expect(clearObject({ items: [{ id: 1 }, { id: 2 }, { id: 3 } ] })).toEqual({ items: [{ id: 1 }, { id: 2 }, { id: 3 } ] })
  })

  test('clearObject({}) should return null', () => {
    expect(clearObject({})).toBe(null)
  })

  test('clearObject([]) should return null', () => {
    expect(clearObject([])).toBe(null)
  })

})

utils_objects.js

const defaultIsMatchFn = val => val === null || val === undefined || val === ''

export function clearObject(obj, isMatchFn = defaultIsMatchFn) {
  if (isMatchFn(obj)) return null

  if (typeof obj === 'object') {
    const initial = obj instanceof Array ? [] : {}

    const result = Object.keys(obj).reduce((acc, key) => {
      const value = clearObject(obj[key])
      return Object.assign(initial, acc, defaultIsMatchFn(value) ? {} : { [key]: value })
    }, initial)

    return Object.keys(result).length ? result : null
  }
  return obj
}