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script.js
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script.js
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class Calculator{
constructor(previousOperandTextElement,currentOperandTextElement){
this.previousOperandTextElement = previousOperandTextElement;
this.currentOperandTextElement = currentOperandTextElement;
}
// to clear all the numbers
clear(){
this.currentOperand = '';
this.previousOperand = '';
this.operation = undefined;
}
// to delete the number
delete(){
this.currentOperand = this.currentOperand.slice(0,-1);
}
//to display the numbers when click on it
appendNumber(number){
if(number === '.' && this.currentOperand.includes('.')) return;
if(this.currentOperand){
this.currentOperand = this.currentOperand.toString() + number.toString();
}
else{
this.currentOperand = number;
}
}
// to choose the operator
chooseOperation(operation){
if(!this.currentOperand) return;
if(this.previousOperand){
this.compute();
}
this.operation = operation;
this.previousOperand = this.currentOperand;
this.currentOperand = "";
}
// to take the values of previous and current and compute it
compute(){
let computation;
let prev = parseFloat(this.previousOperand);
let current = parseFloat(this.currentOperand);
if(!prev || !current) return;
switch(this.operation){
case '+':
computation = prev + current;
break;
case '-':
computation = prev - current;
break;
case '*':
computation = prev * current;
break;
case '÷':
computation = prev / current;
break;
default:
return;
}
this.currentOperand = computation;
this.operation = undefined;
this.previousOperand = '';
}
// getDisplayNumber(number){
// const stringNumber = number.toString();
// const integerDigits = stringNumber.split('.')[0];
// const decimalDigits = stringNumber.split('.')[1];
// let integerDisplay;
// if(isNaN(integerDisplay)){
// integerDisplay = '';
// }else{
// integerDisplay = integerDigits.toLocaleString('en', {maximumFractionDigits:0})
// }
// if(decimalDigits){
// return `${integerDisplay}.${decimalDigits}`
// }
// else{
// return integerDisplay;
// }
// }
// update the values on the output
updateDisplay(){
this.currentOperandTextElement.innerText = this.currentOperand;
if(this.operation){
this.previousOperandTextElement.innerText = `${this.previousOperand} ${this.operation}`;
}else{
this.previousOperandTextElement.innerText = '';
}
}
}
const numberButtons = document.querySelectorAll('[data-number]');
const operationButtons = document.querySelectorAll('[data-operation]');
const equalsButton = document.querySelector('[data-equals]');
const deleteButton = document.querySelector('[data-delete]');
const allClearButton = document.querySelector('[data-all-clear]');
const previousOperandTextElement = document.querySelector('[data-previous-operand]');
const currentOperandTextElement = document.querySelector('[data-current-operand]');
const calculator = new Calculator(previousOperandTextElement,currentOperandTextElement);
// for number button
numberButtons.forEach(button => {
button.addEventListener('click',() =>{
calculator.appendNumber(button.innerText);
calculator.updateDisplay()
})
})
// for operation button
operationButtons.forEach(button => {
button.addEventListener('click',() =>{
calculator.chooseOperation(button.innerText);
calculator.updateDisplay()
})
})
// for equal button
equalsButton.addEventListener('click',() =>{
calculator.compute();
calculator.updateDisplay()
})
// for all clear button
allClearButton.addEventListener('click',() =>{
calculator.clear();
calculator.updateDisplay()
})
// for delete a number button
deleteButton.addEventListener('click',() =>{
calculator.delete();
calculator.updateDisplay()
})
// for toggle button
const checkbox = document.getElementById('checkbox');
checkbox.addEventListener('change', () => {
// change the theme of the calculator
document.body.classList.toggle('dark');
})