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Провести code review для следующей части кода, которая используется в качестве redux reducer.

export const initialState = {
    test: null,
    post: [{
        title: null,
        author: {
            email: null,
 userPic: null,

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const fs = require('fs');


let reader = fs.createReadStream('books.csv', 'utf8');
let writer = fs.createWriteStream("books.json");

let result= [];
let index = null;
let data = '';
reader.on('data', (chunk) =>{

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describe('isEven', ()=>{
    it('Returns True if **num** is even', ()=>{
        const result = isEven(2);
        expect(result).toBeTruthy()
    })
    it('Returns False if **num** is odd', ()=>{
        const result = isEven(1);
        expect(result).toBeFalsy()
    })

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export const getScore = (offset: number) : {home: number, away: number} => {
    let start = 0;
        let end = scoreStamps.length - 1
        let guess = Math.floor((start + end) / 2);
           while(start <= end){
              if(offset ===  scoreStamps[guess].offset){
                return scoreStamps[guess].score
              }
              if(offset > scoreStamps[guess].offset ){
                start = guess + 1;

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export function isIE() {
  
    var ua = window.navigator.userAgent; //Check the userAgent property of the window.navigator object
    var msie = ua.indexOf('MSIE '); // IE 10 or older
    var trident = ua.indexOf('Trident/'); //IE 11
  
    return (msie > 0 || trident > 0);
  }

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function findNumber(number) {
    let max = 1024;
    let min = 0;
    if(number > max || number < min){
        console.log(`Number must be in range ${min} - ${max}`)
        return;
    }
    let guess;
    let step = 0;

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/*
function takes 3 parameters:
str - string to convert
state - case "up" = uppercase, "low" = lowercase 
invert(optional) - if true, the first letter will be oposite case    
*/
function convertString(str, state, invert) {
    let result = '';
    switch (state) {
        case 'low':