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let store = {

first: '',

second: '',

clickedOperator: false,

operatorSymbol: '',

result: '',

};

let result;

function getTag(selector) {

return document.querySelector(selector);

}

function getAllTag(selector) {

return document.querySelectorAll(selector);

}

function calculate(operator) {

if (typeof store.first == 'number') {

store.clickedOperator = true;

}

if (operator === '=') {

store.clickedOperator = false;

switch (store.operatorSymbol) {

case '/':

if ((store.first !== '') & (store.second !== '')) {

screen.innerHTML = store.first / store.second;

store.result = Number(store.first / store.second);

store.first = store.result;

store.second = '';

}

break;

case '*':

if ((store.first !== '') & (store.second !== '')) {

screen.innerHTML = store.first * store.second;

store.result = Number(store.first * store.second);

store.first = store.result;

store.second = '';

}

break;

case '-':

if ((store.first !== '') & (store.second !== '')) {

screen.innerHTML = store.first - store.second;

store.result = Number(store.first - store.second);

store.first = store.result;

store.second = '';

}

break;

case '+':

if ((store.first !== '') & (store.second !== '')) {

screen.innerHTML = store.first + store.second;

store.result = Number(store.first + store.second);

store.first = store.result;

store.second = '';

}

break;

}

} else if (

typeof store.first == 'number' &&

typeof store.second == 'number'

) {

switch (store.operatorSymbol) {

case '/':

if (typeof store.first == 'number') {

store.result = Number(store.first / store.second);

screen.innerHTML = store.result;

store.first = store.result;

store.second = '';

store.operatorSymbol = operator;

}

break;

case '*':

if (typeof store.first == 'number') {

store.result = Number(store.first * store.second);

screen.innerHTML = store.result;

store.first = store.result;

store.second = '';

store.operatorSymbol = operator;

}

break;

case '-':

if (typeof store.first == 'number') {

store.result = Number(store.first - store.second);

screen.innerHTML = store.result;

store.first = store.result;

store.second = '';

store.operatorSymbol = operator;

}

break;

case '+':

if (typeof store.first == 'number') {

store.result = Number(store.first + store.second);

screen.innerHTML = store.result;

store.first = store.result;

store.second = '';

store.operatorSymbol = operator;

}

break;

}

} else {

store.operatorSymbol = operator;

}

}

const screen = getTag('.screen');

const clear = getTag('.clear');

const initialize = getTag('.initialize');

const numbers = getAllTag('.btn.number');

const operators = getAllTag('.btn.operator');

clear.addEventListener('click', () => {

if (!store.clickedOperator) {

store.first = '';

screen.innerHTML = '';

} else {

store.second = '';

screen.innerHTML = '';

}

});

initialize.addEventListener('click', () => {

store.first = '';

store.second = '';

screen.innerHTML = '';

store.clickedOperator = false;

try {

previousClick.classList.remove('clicked');

} catch {}

});

numbers.forEach((number) => {

number.addEventListener('click', (e) => {

if (!store.clickedOperator) {

store.first = Number((screen.innerHTML += e.target.innerHTML));

} else {

screen.innerHTML = Number((store.second += e.target.innerHTML));

store.second = Number(screen.innerHTML);

}

});

});

let previousClick;

let clicked;

operators.forEach((operator) => {

operator.addEventListener('click', (e) => {

if (!clicked) {

previousClick = e.target;

e.target.classList.add('clicked');

clicked = true;

} else {

previousClick.classList.remove('clicked');

previousClick = e.target;

e.target.classList.add('clicked');

}

calculate(e.target.innerHTML);

});

});