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finished calculator basic implementation #384

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1 change: 1 addition & 0 deletions .gitignore
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.prettierrc
138 changes: 138 additions & 0 deletions index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="./styles.css" />
<title>Document</title>
</head>
<body>
<main>
<div class="calculator">
<div class="bar">
<p class="operation-text">0</p>
</div>
<div class="numbers">
<p data-value="7" class="button">7</p>
<p data-value="8" class="button">8</p>
<p data-value="9" class="button">9</p>
<p data-value="/" class="button">/</p>
<p data-value="4" class="button">4</p>
<p data-value="5" class="button">5</p>
<p data-value="6" class="button">6</p>
<p data-value="X" class="button">X</p>
<p data-value="1" class="button">1</p>
<p data-value="2" class="button">2</p>
<p data-value="3" class="button">3</p>
<p data-value="+" class="button">+</p>
<p data-value="0" class="button">0</p>
<p data-value="." class="button">.</p>
<p data-value="=" class="button">=</p>
<p data-value="-" class="button">-</p>
</div>
</div>
<script>
class Calculator {
constructor() {
this.num1 = "";
this.num2 = "";
this.op = null;
this.hasDecimal = false;
this.currentNumber = 0;
this.OPERATIONS = {
"+": this.add,
"-": this.subtract,
"X": this.multiply,
"/": this.divide,
};
}

handleClick(e) {
e.stopPropagation();
const value = e.target.dataset.value;

// no value clicked
if (!value) {
return;
} else if (Object.keys(this.OPERATIONS).includes(value)) {
// clicked on operation
// check if both numbers are present if so get result
if (this.op !== null) {
let result = this.OPERATIONS[value](
parseInt(this.num1),
parseInt(this.num2)
);
this.op = value;
this.num1 = result;
this.num2 = "";
} else {
this.op = value;
}
} else if (value === "=") {
if (this.num2 !== "") {
let result = this.equals(this.num1, this.num2);
this.num1 = result;
this.op = null;
this.num2 = "";
} else {
return;
}
} else {
if (Number.isInteger(parseInt(value))) {
if (this.op !== null) {
this.num2 = this.num2 + value;
} else {
this.num1 = this.num1 + value;
}
}
}
this.updateBar();
console.log({ num1: this.num1, num2: this.num2, op: this.op });
}

add(a, b) {
return a + b;
}

subtract(a, b) {
return a - b;
}
multiply(a, b) {
return a * b;
}
divide(a, b) {
return a / b;
}

equals(a, b) {
const op = this.op;

if (op && this.num2 !== "") {
let result = this.OPERATIONS[`${op}`](
parseInt(this.num1),
parseInt(this.num2)
);
this.op = null;
return result;
}
return;
}

updateBar() {
const operationText = document.querySelector(".operation-text");
operationText.innerHTML = `${this.num1 ? this.num1 : 0} ${
!this.op ? "" : this.op
} ${this.num2 ? this.num2 : ""}`;
}
}

const calc = new Calculator();
const buttons = document.querySelectorAll(".button");

buttons.forEach((elem) =>
elem.addEventListener("click", calc.handleClick.bind(calc))
);
</script>
</main>
</body>
</html>
46 changes: 46 additions & 0 deletions styles.css
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*,
*::before,
*::after {
box-sizing: border-box;
margin: 0;
padding: 0;
}

.calculator {
background-color: black;
width: 400px;
height: 500px;
border-radius: 40px;
padding: 30px;
}

.bar {
background-color: white;
height: 60px;
display: flex;
flex-direction: row-reverse;
align-items: center;
padding: 0 10px;
margin-bottom: 40px;
}
.operation-text {
font-size: 40px;
font-weight: bold;
}

.numbers {
width: 100%;
display: flex;
flex-wrap: wrap;
gap: 10px;
}

.numbers > p {
flex: 1 0 20%;
background-color: white;
text-align: center;
padding: 16px 20px;
border-radius: 50%;
font-size: 36px;
font-weight: bold;
}