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25 changes: 25 additions & 0 deletions 30-counter-app/index.html
Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Counter App</title>
<link rel="stylesheet" href="style.css" />
<script src="script.js" defer></script>
</head>
<body>
<div class="container">
<h1>Counter App</h1>
<p class="outputValue">0</p>
<div class="box-one">
<button class="minusButton btn-sty">-</button>
<button class="plusButton btn-sty">+</button>
</div>
<div class="box-two">
<p>Increment / Decrement By :</p>
<input class="input-sty" type="number" value="1" />
</div>
<button type="submit" class="resetButton">Reset</button>
</div>
</body>
</html>
22 changes: 22 additions & 0 deletions 30-counter-app/script.js
Original file line number Diff line number Diff line change
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const decreaseButton = document.querySelector('.minusButton');
const increaseButton = document.querySelector('.plusButton');
const outputValue = document.querySelector('.outputValue');
const userInput = document.querySelector('.input-sty');
const resetButton = document.querySelector('.resetButton');

decreaseButton.addEventListener('click', () => {
const resultValue = parseInt(outputValue.innerText);
const userInputValue = parseInt(userInput.value);
outputValue.innerText = resultValue - userInputValue;
});

increaseButton.addEventListener('click', () => {
const resultValue = parseInt(outputValue.innerText);
const userInputValue = parseInt(userInput.value);
Comment on lines +8 to +15
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Copilot AI Oct 17, 2025

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parseInt() returns NaN when the input is invalid or empty, which will cause the counter to display NaN. Consider using parseInt() with a fallback value or validating the input first.

Suggested change
const resultValue = parseInt(outputValue.innerText);
const userInputValue = parseInt(userInput.value);
outputValue.innerText = resultValue - userInputValue;
});
increaseButton.addEventListener('click', () => {
const resultValue = parseInt(outputValue.innerText);
const userInputValue = parseInt(userInput.value);
const resultValue = Number.isNaN(parseInt(outputValue.innerText)) ? 0 : parseInt(outputValue.innerText);
const userInputValue = Number.isNaN(parseInt(userInput.value)) ? 1 : parseInt(userInput.value);
outputValue.innerText = resultValue - userInputValue;
});
increaseButton.addEventListener('click', () => {
const resultValue = Number.isNaN(parseInt(outputValue.innerText)) ? 0 : parseInt(outputValue.innerText);
const userInputValue = Number.isNaN(parseInt(userInput.value)) ? 1 : parseInt(userInput.value);

Copilot uses AI. Check for mistakes.
Comment on lines +8 to +15
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Copilot AI Oct 17, 2025

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parseInt() returns NaN when the input is invalid or empty, which will cause the counter to display NaN. Consider using parseInt() with a fallback value or validating the input first.

Suggested change
const resultValue = parseInt(outputValue.innerText);
const userInputValue = parseInt(userInput.value);
outputValue.innerText = resultValue - userInputValue;
});
increaseButton.addEventListener('click', () => {
const resultValue = parseInt(outputValue.innerText);
const userInputValue = parseInt(userInput.value);
let resultValue = parseInt(outputValue.innerText);
if (isNaN(resultValue)) resultValue = 0;
let userInputValue = parseInt(userInput.value);
if (isNaN(userInputValue)) userInputValue = 1;
outputValue.innerText = resultValue - userInputValue;
});
increaseButton.addEventListener('click', () => {
let resultValue = parseInt(outputValue.innerText);
if (isNaN(resultValue)) resultValue = 0;
let userInputValue = parseInt(userInput.value);
if (isNaN(userInputValue)) userInputValue = 1;

Copilot uses AI. Check for mistakes.
outputValue.innerText = resultValue + userInputValue;
});

resetButton.addEventListener('click', () => {
outputValue.innerText = 0;
userInput.value = 1;
});
95 changes: 95 additions & 0 deletions 30-counter-app/style.css
Original file line number Diff line number Diff line change
@@ -0,0 +1,95 @@
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
min-height: 100vh;
display: flex;
justify-content: center;
align-items: center;
background-color: #191a1b;
font-family: 'Winky Sans', sans-serif;
color: white;
}
.container {
width: 100%;
max-width: 390px;
min-height: 380px;
background-color: #25384b;
display: flex;
flex-direction: column;
align-items: center;
row-gap: 20px;
border-radius: 10px;
box-shadow: 3px 1px 0px white;
}
.container h1 {
margin-top: 16px;
}
.outputValue {
font-size: 48px;
}
.box-one {
display: flex;
column-gap: 32px;
margin: 16px 0px;
}
.btn-sty {
color: #ecf0f1;
border-radius: 5px;
border: solid 1px #f39c12;
background: #e67e22;
text-align: center;
padding: 0px 30px;
font-size: 2.1em;
-webkit-transition: all 0.1s;
-moz-transition: all 0.1s;
transition: all 0.1s;
-webkit-box-shadow: 0px 6px 0px #d35400;
-moz-box-shadow: 0px 6px 0px #d35400;
box-shadow: 0px 6px 0px #d35400;
}
.btn-sty:active {
-webkit-box-shadow: 0px 2px 0px #d35400;
-moz-box-shadow: 0px 2px 0px #d35400;
box-shadow: 0px 2px 0px #d35400;
position: relative;
top: 4px;
}
.box-two {
display: flex;
column-gap: 16px;
margin-bottom: 16px;
}
.box-two p {
font-size: 19px;
}
.input-sty {
width: 100%;
max-width: 50px;
border-radius: 5px;
padding: 5px 5px;
}
.resetButton {
color: #ecf0f1;
border-radius: 5px;
border: solid 1px #ff0000;
background: #e62222;
text-align: center;
padding: 5px 15px;
font-size: 1.2em;
-webkit-transition: all 0.1s;
-moz-transition: all 0.1s;
transition: all 0.1s;
-webkit-box-shadow: 0px 6px 0px #e62222;
-moz-box-shadow: 0px 6px 0px #e62222;
box-shadow: 0px 6px 0px #b20000;
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Inconsistent box-shadow colors for the reset button. The webkit and moz prefixes use #e62222 while the standard property uses #b20000, creating visual inconsistencies across browsers.

Suggested change
box-shadow: 0px 6px 0px #b20000;
box-shadow: 0px 6px 0px #e62222;

Copilot uses AI. Check for mistakes.
}
.resetButton:active {
-webkit-box-shadow: 0px 2px 0px #e62222;
-moz-box-shadow: 0px 2px 0px #e62222;
box-shadow: 0px 2px 0px #e62222;
Comment on lines +90 to +92
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Copilot AI Oct 17, 2025

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Inconsistent box-shadow color for the reset button active state. The colors should match the inactive state pattern or use consistent colors across all three declarations.

Copilot uses AI. Check for mistakes.
position: relative;
top: 4px;
}