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script.js
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const numberButtons = document.querySelectorAll('[data-number]');
const operatorButtons = document.querySelectorAll('[data-operator]');
const allClearButton = document.querySelector('[data-all-clear]');
const deleteButton = document.querySelector('[data-delete]');
const equalButton = document.querySelector('[data-equal]');
const previousDisplay = document.querySelector('[data-previous]');
const currentDisplay = document.querySelector('[data-current]');
class Calculator {
constructor(currentDisplay, previousDisplay) {
this.currentDisplay = currentDisplay;
this.previousDisplay = previousDisplay;
this.clear();
}
clear() {
this.currentOperand = '';
this.previousOperand = '';
this.operator = undefined;
}
delete() {
this.currentOperand = this.currentOperand.toString().slice(0, -1);
}
chooseOperator(operator) {
if (this.currentOperand == '') return
if (this.previousOperand != '') {
this.compute();
}
this.operator = operator;
this.previousOperand = this.currentOperand;
this.currentOperand = '';
}
compute() {
let computation;
const prev = parseFloat(this.previousOperand);
const curr = parseFloat(this.currentOperand);
if (isNaN(prev) || isNaN(curr)) return
switch (this.operator) {
case '+':
computation = prev + curr;
console.log(computation)
break;
case '-':
computation = prev - curr;
break;
case '×':
computation = prev * curr;
break;
case '÷':
computation = prev / curr;
break;
default:
return
}
this.currentOperand = computation;
this.previousOperand = '';
this.operator = undefined;
}
appendNumber(number) {
if (number === '.' && this.currentOperand.includes('.')) return
this.currentOperand = this.currentOperand.toString() + number;
}
updateDisplay() {
this.currentDisplay.innerText = this.currentOperand;
if (this.operator != null) {
this.previousDisplay.innerText = `${this.previousOperand} ${this.operator}`;
} else {
this.previousDisplay.innerText = '';
}
}
}
const calculator = new Calculator(currentDisplay, previousDisplay);
allClearButton.addEventListener('click', button => {
calculator.clear();
calculator.updateDisplay();
setTimeout(() => {
allClearButton.style.setProperty('--bs', `4px 4px 4px rgba(0, 0, 0, 0.3),
-4px -4px 4px rgba(255, 255, 255, 0.3),
inset -4px -4px 4px rgba(0, 0, 0, 0.3),
inset 4px 4px 4px rgba(255, 255, 255, 0.5)`);
}, 75);
allClearButton.style.setProperty('--bs', `4px 4px 4px rgba(0, 0, 0, 0.3),
-4px -4px 4px rgba(255, 255, 255, 0.3),
inset 4px 4px 4px rgba(0, 0, 0, 0.3),
inset -4px -4px 4px rgba(255, 255, 255, 0.5)`)
})
deleteButton.addEventListener('click', button => {
calculator.delete();
calculator.updateDisplay();
setTimeout(() => {
deleteButton.style.setProperty('--bs', `4px 4px 4px rgba(0, 0, 0, 0.3),
-4px -4px 4px rgba(255, 255, 255, 0.3),
inset -4px -4px 4px rgba(0, 0, 0, 0.3),
inset 4px 4px 4px rgba(255, 255, 255, 0.5)`);
}, 75);
deleteButton.style.setProperty('--bs', `4px 4px 4px rgba(0, 0, 0, 0.3),
-4px -4px 4px rgba(255, 255, 255, 0.3),
inset 4px 4px 4px rgba(0, 0, 0, 0.3),
inset -4px -4px 4px rgba(255, 255, 255, 0.5)`)
})
equalButton.addEventListener('click', button => {
calculator.compute();
calculator.updateDisplay();
setTimeout(() => {
equalButton.style.setProperty('--bs', `4px 4px 4px rgba(0, 0, 0, 0.3),
-4px -4px 4px rgba(255, 255, 255, 0.3),
inset -4px -4px 4px rgba(0, 0, 0, 0.3),
inset 4px 4px 4px rgba(255, 255, 255, 0.5)`);
}, 75);
equalButton.style.setProperty('--bs', `4px 4px 4px rgba(0, 0, 0, 0.3),
-4px -4px 4px rgba(255, 255, 255, 0.3),
inset 4px 4px 4px rgba(0, 0, 0, 0.3),
inset -4px -4px 4px rgba(255, 255, 255, 0.5)`)
})
for (let i of operatorButtons) {
i.addEventListener('click', () => {
calculator.chooseOperator(i.innerText);
calculator.updateDisplay();
setTimeout(() => {
i.style.setProperty('--bs', `4px 4px 4px rgba(0, 0, 0, 0.3),
-4px -4px 4px rgba(255, 255, 255, 0.3),
inset -4px -4px 4px rgba(0, 0, 0, 0.3),
inset 4px 4px 4px rgba(255, 255, 255, 0.5)`);
}, 75);
i.style.setProperty('--bs', `4px 4px 4px rgba(0, 0, 0, 0.3),
-4px -4px 4px rgba(255, 255, 255, 0.3),
inset 4px 4px 4px rgba(0, 0, 0, 0.3),
inset -4px -4px 4px rgba(255, 255, 255, 0.5)`)
})
}
for (let x of numberButtons) {
x.addEventListener('click', () => {
calculator.appendNumber(x.innerText);
calculator.updateDisplay();
setTimeout(() => {
x.style.setProperty('--bs', `4px 4px 4px rgba(0, 0, 0, 0.3),
-4px -4px 4px rgba(255, 255, 255, 0.3),
inset -4px -4px 4px rgba(0, 0, 0, 0.3),
inset 4px 4px 4px rgba(255, 255, 255, 0.5)`);
}, 75);
x.style.setProperty('--bs', `4px 4px 4px rgba(0, 0, 0, 0.3),
-4px -4px 4px rgba(255, 255, 255, 0.3),
inset 4px 4px 4px rgba(0, 0, 0, 0.3),
inset -4px -4px 4px rgba(255, 255, 255, 0.5)`)
})
}