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[FE] Code Challenge - Quoc Tien Vo #173

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[FE] Code Challenge - Quoc Tien Vo #173

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eadd58d
solved problem 1
tien717 Nov 5, 2025
d3afb01
feat: solved problem 2
tien717 Nov 6, 2025
a364ef2
solved problem 3
tien717 Nov 6, 2025
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53 changes: 53 additions & 0 deletions src/problem1/solution.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,53 @@
// Solution A
var sum_to_n_a = function(n) {
if (n < 0) {
let sum = 0;
for (let i = n; i <= 0; i++) {
sum += i;
}
return sum;
}

let sum = 0;
for (let i = 1; i <= n; i++) {
sum += i;
}
return sum;
};

// Solution B
var sum_to_n_b = function(n) {
return n * (n + 1) / 2;
};

// Solution C
var sum_to_n_c = function(n) {
if (n === 0) {
return 0;
}

if (n < 0) {
return n + sum_to_n_c(n + 1);
}

return n + sum_to_n_c(n - 1);
};

console.log("Testing Solution A::");
console.log("sum_to_n_a(5) =", sum_to_n_a(5));
console.log("sum_to_n_a(10) =", sum_to_n_a(10));
console.log("sum_to_n_a(0) =", sum_to_n_a(0));
console.log("sum_to_n_a(-5) =", sum_to_n_a(-5));

console.log("Testing Solution B:");
console.log("sum_to_n_b(5) =", sum_to_n_b(5));
console.log("sum_to_n_b(10) =", sum_to_n_b(10));
console.log("sum_to_n_b(0) =", sum_to_n_b(0));
console.log("sum_to_n_b(-5) =", sum_to_n_b(-5));

console.log("Testing Solution C:");
console.log("sum_to_n_c(5) =", sum_to_n_c(5));
console.log("sum_to_n_c(10) =", sum_to_n_c(10));
console.log("sum_to_n_c(0) =", sum_to_n_c(0));
console.log("sum_to_n_c(-5) =", sum_to_n_c(-5));

28 changes: 28 additions & 0 deletions src/problem2/.gitignore
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# Dependencies
node_modules/

# Build output
dist/

# Logs
*.log
npm-debug.log*

# Environment files
.env
.env.local
.env.*.local

# Editor directories
.vscode/
.idea/
*.swp
*.swo

# OS files
.DS_Store
Thumbs.db

# Vite cache
.vite/

150 changes: 136 additions & 14 deletions src/problem2/index.html
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@@ -1,27 +1,149 @@
<html>
<!DOCTYPE html>
<html lang="en">

<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Fancy Form</title>

<!-- You may add more stuff here -->
<link href="style.css" rel="stylesheet" />
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet">
</head>

<body>
<div class="container">
<div class="swap-card">
<div class="card-header">
<h1>Swap Tokens</h1>
<p class="subtitle">Trade tokens in seconds</p>
</div>

<form id="swap-form">
<div class="input-group">
<div class="input-header">
<label for="from-amount">You Pay</label>
<span class="balance" id="from-balance">Balance: --</span>
</div>
<div class="input-wrapper">
<input
type="text"
id="from-amount"
placeholder="0.0"
autocomplete="off"
inputmode="decimal"
/>
<button type="button" class="token-selector" id="from-token-btn">
<div class="token-display">
<img src="" alt="" class="token-icon" id="from-token-icon" />
<span class="token-symbol" id="from-token-symbol">Select</span>
</div>
<svg class="chevron" width="12" height="12" viewBox="0 0 12 12" fill="none">
<path d="M2.5 4.5L6 8L9.5 4.5" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
</button>
</div>
<div class="input-footer">
<span class="usd-value" id="from-usd">$0.00</span>
</div>
<div class="error-message" id="from-error"></div>
</div>

<div class="swap-direction">
<button type="button" class="swap-direction-btn" id="swap-direction">
<svg width="16" height="16" viewBox="0 0 16 16" fill="none">
<path d="M3 8H13M13 8L9.5 4.5M13 8L9.5 11.5" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M3 8L6.5 4.5M3 8L6.5 11.5" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
</button>
</div>

<div class="input-group">
<div class="input-header">
<label for="to-amount">You Receive</label>
<span class="balance" id="to-balance">Balance: --</span>
</div>
<div class="input-wrapper">
<input
type="text"
id="to-amount"
placeholder="0.0"
autocomplete="off"
inputmode="decimal"
readonly
/>
<button type="button" class="token-selector" id="to-token-btn">
<div class="token-display">
<img src="" alt="" class="token-icon" id="to-token-icon" />
<span class="token-symbol" id="to-token-symbol">Select</span>
</div>
<svg class="chevron" width="12" height="12" viewBox="0 0 12 12" fill="none">
<path d="M2.5 4.5L6 8L9.5 4.5" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
</button>
</div>
<div class="input-footer">
<span class="usd-value" id="to-usd">$0.00</span>
</div>
</div>

<div class="exchange-info" id="exchange-info" style="display: none;">
<div class="info-row">
<span class="info-label">Exchange Rate</span>
<span class="info-value" id="exchange-rate">--</span>
</div>
<div class="info-row">
<span class="info-label">Price Impact</span>
<span class="info-value" id="price-impact">< 0.01%</span>
</div>
<div class="info-row">
<span class="info-label">Network Fee</span>
<span class="info-value">~$0.50</span>
</div>
</div>

<button type="submit" class="submit-btn" id="submit-btn" disabled>
<span class="btn-text">Select tokens to swap</span>
<div class="btn-loader" style="display: none;">
<div class="spinner"></div>
<span>Processing...</span>
</div>
</button>

<!-- You may reorganise the whole HTML, as long as your form achieves the same effect. -->
<form onsubmit="return !1">
<h5>Swap</h5>
<label for="input-amount">Amount to send</label>
<input id="input-amount" />
<div class="success-message" id="success-message" style="display: none;">
<svg class="success-icon" width="20" height="20" viewBox="0 0 20 20" fill="none">
<path d="M16.6667 5L7.5 14.1667L3.33334 10" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
<span>Swap successful!</span>
</div>
</form>
</div>

<label for="output-amount">Amount to receive</label>
<input id="output-amount" />
<div class="modal" id="token-modal" style="display: none;">
<div class="modal-backdrop" id="modal-backdrop"></div>
<div class="modal-content">
<div class="modal-header">
<h2>Select a token</h2>
<button type="button" class="close-btn" id="close-modal">
<svg width="24" height="24" viewBox="0 0 24 24" fill="none">
<path d="M18 6L6 18M6 6L18 18" stroke="currentColor" stroke-width="2" stroke-linecap="round"/>
</svg>
</button>
</div>
<div class="modal-search">
<input type="text" id="token-search" placeholder="Search name or symbol" autocomplete="off" />
</div>
<div class="token-list" id="token-list">
<div class="loading-tokens">
<div class="spinner"></div>
<span>Loading tokens...</span>
</div>
</div>
</div>
</div>
</div>

<button>CONFIRM SWAP</button>
</form>
<script src="script.js"></script>
<script type="module" src="script.js"></script>
</body>

</html>
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