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script.js
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script.js
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class Calculator{
constructor(previousCalText, currentCalcText){
this.previousCalText = previousCalText;
this.currentCalcText = currentCalcText;
this.clear()
}
clear(){
this.currOperation = '';
this.prevOperation = '';
this.operator = undefined;
}
backspace(){
this.currOperation = this.currOperation.toString()
this.currOperation = this.currOperation.slice(0,-1)
}
equalfunction(){
if (this.currOperation =="" && this.prevOperation != "") {
this.currOperation = this.prevOperation;
this.prevOperation = '';
this.operator = undefined;
}else{
this.calculate()
}
}
calculate(){
let val;
const prevVal = parseFloat(this.prevOperation);
const currVal = parseFloat(this.currOperation);
if (isNaN(prevVal) || isNaN(currVal)) return
switch(this.operator) {
case "+":
val = prevVal + currVal;
break
case "-":
val = prevVal - currVal;
break
case "*":
val = prevVal * currVal;
break
case "/":
val = prevVal / currVal;
break
case "%":
val = prevVal * (currVal/100);
break
default:
return;
}
this.currOperation = val;
this.operator = undefined;
this.prevOperation = "";
}
addNum(number){
if(number === "." && this.currOperation.includes(".")) return;
this.currOperation = this.currOperation.toString() + number.toString();
}
selectOperator(operator){
if (this.currentOperation === "") return
if (this.prevOperation != ''){
this.calculate()
}
this.operator = operator;
if (this.currOperation === "" && this.prevOperation != "") {
return
}else{
this.prevOperation = this.currOperation;
this.currOperation = '';
}
}
formatNumber(number){
const stringNumber = number.toString();
const integerDigits = parseFloat(stringNumber.split('.')[0]);
const decimalDigits = stringNumber.split('.')[1];
let integerDisplay;
if (isNaN(integerDigits)) {
integerDisplay = ''
}else {
integerDisplay = integerDigits.toLocaleString('en-us', { maximumFractionDigits: 0 })
}
if (decimalDigits != null) {
return `${integerDisplay}.${decimalDigits}`
} else {
return integerDisplay
}
}
updateOutput(){
this.currentCalcText.innerText = this.formatNumber(this.currOperation);
if (this.operator != null) {
this.previousCalText.innerText = this.formatNumber(this.prevOperation) + " " + this.operator.toString();
}else{
this.previousCalText.innerText = "";
}
}
}
const numButtons = document.querySelectorAll('[data-number]');
const operatorButtons = document.querySelectorAll('[data-operation]');
const clearButton = document.querySelector('[data-clear]');
const backspaceButton = document.querySelector('[data-delete]');
const equalButton = document.querySelector('[data-equal]');
const previousCalText = document.getElementById("calculation");
const currentCalcText = document.getElementById("output");
const calculator = new Calculator(previousCalText, currentCalcText);
clearButton.addEventListener('click', ()=>{
calculator.clear();
calculator.updateOutput();
})
backspaceButton.addEventListener('click', ()=>{
calculator.backspace();
calculator.updateOutput();
})
numButtons.forEach(button => {
button.addEventListener('click', () =>{
calculator.addNum(button.innerText);
calculator.updateOutput();
})
})
operatorButtons.forEach(button => {
button.addEventListener('click', () =>{
calculator.selectOperator(button.id)
calculator.updateOutput();
})
})
equalButton.addEventListener('click', ()=>{
calculator.equalfunction();
calculator.updateOutput();
})