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main.js
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main.js
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class Calculator {
constructor(previousOperandTextElement, currentOperandTextElement) {
this.previousOperandTextElement = previousOperandTextElement;
this.currentOperandTextElement = currentOperandTextElement;
this.clear()
}
clear() {
this.currentOperand = '';
this.previousOperand = '';
this.operation = undefined;
}
delete() {
this.currentOperand = this.currentOperand.toString().slice(0, -1);
}
appendNumber(number) {
if (number === '.' && this.currentOperand.includes('.')) return;
this.currentOperand = this.currentOperand.toString() + number.toString();
}
chooseOperation(operation) {
if (this.currentOperand === '') return;
if (this.previousOperand !== '') {
this.compute()
}
this.operation = operation;
this.previousOperand = this.currentOperand;
this.currentOperand = '';
}
compute() {
let computaion;
const previous = parseFloat(this.previousOperand);
const current = parseFloat(this.currentOperand);
if (isNaN(previous) || isNaN(current)) return;
switch (this.operation) {
case '+':
computaion = previous + current;
break;
case '-':
computaion = previous - current;
break;
case '*':
computaion = previous * current;
break;
case '÷':
computaion = previous / current;
break;
default:
return;
}
this.currentOperand = computaion;
this.operation = undefined;
this.previousOperand = '';
}
getDisplayNumber(number) {
const stringNumber = number.toString();
const intergerDigits = parseFloat(stringNumber.split('.')[0]);
const decimalDigits = stringNumber.split('.')[1];
let intergerDisplay;
if(isNaN(intergerDigits)) {
intergerDisplay = '';
} else {
intergerDisplay = intergerDigits.toLocaleString('en', {maximumFranctionDigits: 0})
};
if (decimalDigits != null) {
return `${intergerDisplay}.${decimalDigits}`;
} else {
return intergerDisplay;
}
}
updateDisplay() {
this.currentOperandTextElement.innerText = this.getDisplayNumber(this.currentOperand);
if (this.operation != null) {
this.previousOperandTextElement.innerText = `${this.getDisplayNumber(this.previousOperand)} ${this.operation}`;
} else {
this.previousOperandTextElement.innerText = '';
}
}
}
const numberButtons = document.querySelectorAll('[data-number]');
const operationButtons = document.querySelectorAll('[data-operation]');
const equalButton = 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)
numberButtons.forEach(button => {
button.addEventListener('click', () => {
calculator.appendNumber(button.innerText)
calculator.updateDisplay()
})
})
operationButtons.forEach(button => {
button.addEventListener('click', () => {
calculator.chooseOperation(button.innerText)
calculator.updateDisplay()
})
})
equalButton.addEventListener('click', button => {
calculator.compute();
calculator.updateDisplay();
})
allClearButton.addEventListener('click', button => {
calculator.clear();
calculator.updateDisplay();
})
deleteButton.addEventListener('click', button => {
calculator.delete();
calculator.updateDisplay();
})