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script.js
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script.js
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//elements
//timing
const hourEl = document.querySelector('.hour');
const minutesEl = document.querySelector('.minutes');
const displayEl = document.querySelector('.display');
//funct
const acEl = document.querySelector('.ac');
const pmEl = document.querySelector('.pm');
const percentEl = document.querySelector('.percent');
//operators
const divideEl = document.querySelector('.divide');
const multiplyEl = document.querySelector('.multiply');
const subtractEl = document.querySelector('.subtract');
const addEl = document.querySelector('.add');
const equalEl = document.querySelector('.equal');
const decimalEl = document.querySelector('.decimal');
//numbers
const nineEl = document.querySelector('.nine');
const eightEl = document.querySelector('.eight');
const sevenEl = document.querySelector('.seven');
const sixEl = document.querySelector('.six');
const fiveEl = document.querySelector('.five');
const fourEl = document.querySelector('.four');
const threeEl = document.querySelector('.three');
const twoEl = document.querySelector('.two');
const oneEl = document.querySelector('.one');
const zeroEl = document.querySelector('.zero');
const numberElArray = [zeroEl,oneEl,twoEl,threeEl,fourEl,fiveEl,sixEl,sevenEl,eightEl,nineEl];
//variables
let valueStrInMemory = null;
let operatorInMemory = null;
//functions
const getValueAsStr = () => {
const currentDisplayStr = displayEl.textContent;
return currentDisplayStr.split(',').join('');
}
const getValueAsNum = () =>{
return parseFloat(getValueAsStr());
}
const setStrAsValue = (valueStr) => {
if(valueStr[valueStr.length - 1] === '.'){
displayEl.textContent += '.';
return
}
const [wholeNumStr, decimalStr] = valueStr.split('.');
if(decimalStr){
displayEl.textContent = parseFloat(wholeNumStr).toLocaleString() + '.' + decimalStr;
}
else{
displayEl.textContent = parseFloat(wholeNumStr).toLocaleString();
}
}
const handleNumberClick =(numStr) =>{
const currentDisplayStr = getValueAsStr();
if(currentDisplayStr === '0') {
setStrAsValue(numStr);
}else{
setStrAsValue(currentDisplayStr + numStr);
}
}
const getResultofOperationAsStr = () => {
const currentValueNum = getValueAsNum();
const valueNumInMemory = parseFloat(valueStrInMemory);
let newValueNum;
if(operatorInMemory === 'add'){
newValueNum = valueNumInMemory + currentValueNum;
}else if(operatorInMemory === 'subtract'){
newValueNum = valueNumInMemory - currentValueNum;
}else if(operatorInMemory === 'multiply'){
newValueNum = valueNumInMemory * currentValueNum;
}else if(operatorInMemory === 'divide'){
newValueNum = valueNumInMemory / currentValueNum;
}
return newValueNum.toString();
}
const handleOperatorClick = (operation) => {
const currentDisplayStr = getValueAsStr();
if(!valueStrInMemory){
valueStrInMemory = currentDisplayStr;
operatorInMemory = operation;
setStrAsValue('0');
return;
}
let newValueStr = getResultofOperationAsStr();
valueStrInMemory = newValueStr;
operatorInMemory = operation;
setStrAsValue('0');
}
//event listners to functions
acEl.addEventListener('click' , () => {
setStrAsValue('0');
valueStrInMemory = null;
operatorInMemory = null;
});
pmEl.addEventListener ('click',()=>{
const currentValueNum = getValueAsNum();
const currentDisplayStr = getValueAsStr();
if(currentDisplayStr === '-0'){
setStrAsValue('0');
return;
}
if(currentValueNum>=0){
setStrAsValue('-' + currentDisplayStr);
}else{
setStrAsValue(currentDisplayStr.substring(1));
}
})
percentEl.addEventListener('click',()=>{
const currentValueNum = getValueAsNum();
const newValueNum = currentValueNum / 100;
setStrAsValue(newValueNum.toString());
valueStrInMemory = null;
operatorInMemory = null;
})
//event listners to operators
addEl.addEventListener('click',()=>{
handleOperatorClick('add')
})
subtractEl.addEventListener('click',()=>{
handleOperatorClick('subtract')
})
multiplyEl.addEventListener('click',()=>{
handleOperatorClick('multiply')
})
divideEl.addEventListener('click',()=>{
handleOperatorClick('divide')
})
equalEl.addEventListener('click', () => {
if(valueStrInMemory){
setStrAsValue(getResultofOperationAsStr());
operatorInMemory = null;
valueStrInMemory = null;
}
})
//Event Listeners to numbers
for(let i=0; i < numberElArray.length; i++)
{
const numberEl = numberElArray[i];
numberEl.addEventListener('click',() => {
handleNumberClick(i.toString());
});
}
decimalEl.addEventListener('click',() => {
const currentDisplayStr = getValueAsStr();
if(!currentDisplayStr.includes('.')){
setStrAsValue(currentDisplayStr + '.');
}
})
// time
const updateTime = () => {
const currentTime = new Date();
const currentHour = currentTime.getHours();
const currentMinutes = currentTime.getMinutes();
hourEl.textContent = currentHour.toString();
minutesEl.textContent = currentMinutes.toString().padStart(2 , '0');
}
setInterval(updateTime,1000);
updateTime();