mazeeblanke

export const SET_EXPRESSION = 'SET_EXPRESSION';

export const CLEAR_EXPRESSION = 'CLEAR_EXPRESSION';

export const DELETE_LAST_EXPRESSION_ENTRY = 'DELETE_LAST_EXPRESSION_ENTRY';

export const EVALUATE_EXPRESSION = 'EVALUATE_EXPRESSION';

mazeeblanke

import * as types from '../types';
import calculate from '../../utils/calculate'

let initialState = {
  expression: '',
  total: 0
}

function setExpression({ expression, total}, action) {

mazeeblanke

import { createStore, combineReducers } from 'redux';
import calculateReducer from './reducers/calculateReducer'

const rootReducer = combineReducers({
  calculator: calculateReducer
})

export default createStore(
  rootReducer,
  window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__()

mazeeblanke

export default (expression) => {

  const matched = (new RegExp('([\\d]+\\.?[\\d]*)?([-+/*][\\d]+\\.?[\\d]*)*')).exec(expression)

  if (!matched) {
    return 0;
  }

  if (/^[*+\/]/.test(expression)){
    return () => {

mazeeblanke

import calculate from '../utils/calculate.js'
describe('Calculate', () => {
  let expression;
  it ('evaluates the expression correctly', () => {
    expression = '2+3+4-4*3'
    expect(calculate(expression)).toBe(-3);

    expression = '0+3+4'
    expect(calculate(expression)).toBe(7);