السلام عليكم
اريد شرح لهذه الكود وهو خاص بمشروع الة حاسبة
let runningTotal = 0;
let buffer = "0"
let previousOperator;
const screen = document.querySelector('.screen');
function buttonClick(value){
if(isNaN(value)){
HandleSymbol(value)
}else{
handleNumber(value)
}
screen.innerText = buffer;
}
function HandleSymbol(symbol){
switch(symbol){
case 'C':
buffer = '0'
runningTotal = 0;
break;
case '=':
if(previousOperator=== null){
return
}
flushOperator(parseInt(buffer))
previousOperator = null;
buffer = runningTotal;
runningTotal = 0;
break;
case '←':
if(buffer.length ===1){
buffer = '0';
}else{
buffer = buffer.substring(0, buffer.length -1)
}
break;
case '+' :
case '-' :
case '÷' :
case '×' :
handleMath(symbol)
break;
}
}
function handleMath(symbol){
if(buffer=== '0'){
return;
}
const intBuffer = parseInt(buffer);
if(runningTotal === 0){
runningTotal = intBuffer
}else{
flushOperator(intBuffer)
}
previousOperator = symbol;
buffer = '0';
}
function flushOperator(intBuffer){
if(previousOperator === '+'){
runningTotal += intBuffer;
}else if(previousOperator === '-'){
runningTotal -= intBuffer;
}else if(previousOperator === '×'){
runningTotal *= intBuffer
}else if(previousOperator === '÷'){
runningTotal /= intBuffer;
}
}
function handleNumber(numberString){
if(buffer === "0"){
buffer = numberString;
}else{
buffer += numberString;
}
}
function init(){
document.querySelector('.calc-buttons').addEventListener('click' , function(event){
buttonClick(event.target.innerText);
})
}
init();