From 31afe90caaefeaac295885e92db1f510b0dee2ce Mon Sep 17 00:00:00 2001 From: hainguyen Date: Sun, 8 Feb 2026 20:50:54 -0600 Subject: [PATCH] submit solution --- .gitignore | 2 + readme.md | 19 + src/problem1/.keep | 0 src/problem1/index.js | 21 + src/problem2/index.html | 41 +- src/problem2/package-lock.json | 1954 +++++++++++++++++ src/problem2/package.json | 20 + src/problem2/public/favicon.svg | 1 + src/problem2/script.js | 0 src/problem2/src/App.css | 252 +++ src/problem2/src/App.jsx | 167 ++ src/problem2/src/api/prices.js | 26 + src/problem2/src/components/AmountInput.css | 40 + src/problem2/src/components/AmountInput.jsx | 30 + src/problem2/src/components/TokenSelector.css | 212 ++ src/problem2/src/components/TokenSelector.jsx | 131 ++ src/problem2/src/constants/index.js | 9 + src/problem2/src/hooks/useTokenSwap.js | 132 ++ src/problem2/src/index.css | 67 + src/problem2/src/main.jsx | 10 + src/problem2/src/util/swap.js | 11 + src/problem2/style.css | 8 - src/problem2/vite.config.js | 11 + src/problem3/.keep | 0 src/problem3/problem3.tsx | 85 + src/problem3/refactored.tsx | 102 + src/problem4/.keep | 0 src/problem5/.keep | 0 28 files changed, 3317 insertions(+), 34 deletions(-) create mode 100644 .gitignore delete mode 100644 src/problem1/.keep create mode 100644 src/problem1/index.js create mode 100644 src/problem2/package-lock.json create mode 100644 src/problem2/package.json create mode 100644 src/problem2/public/favicon.svg delete mode 100644 src/problem2/script.js create mode 100644 src/problem2/src/App.css create mode 100644 src/problem2/src/App.jsx create mode 100644 src/problem2/src/api/prices.js create mode 100644 src/problem2/src/components/AmountInput.css create mode 100644 src/problem2/src/components/AmountInput.jsx create mode 100644 src/problem2/src/components/TokenSelector.css create mode 100644 src/problem2/src/components/TokenSelector.jsx create mode 100644 src/problem2/src/constants/index.js create mode 100644 src/problem2/src/hooks/useTokenSwap.js create mode 100644 src/problem2/src/index.css create mode 100644 src/problem2/src/main.jsx create mode 100644 src/problem2/src/util/swap.js delete mode 100644 src/problem2/style.css create mode 100644 src/problem2/vite.config.js delete mode 100644 src/problem3/.keep create mode 100644 src/problem3/problem3.tsx create mode 100644 src/problem3/refactored.tsx delete mode 100644 src/problem4/.keep delete mode 100644 src/problem5/.keep diff --git a/.gitignore b/.gitignore new file mode 100644 index 000000000..91dfed8d4 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +.DS_Store +node_modules \ No newline at end of file diff --git a/readme.md b/readme.md index 1ff4bc95b..cd1555a7b 100644 --- a/readme.md +++ b/readme.md @@ -8,3 +8,22 @@ It is important that you minimally attempt the problems, even if you do not arri ## Submission ## You can either provide a link to an online repository, attach the solution in your application, or whichever method you prefer. We're cool as long as we can view your solution without any pain. + +## Project Structure ## + +``` +code-challenge/ +├── src/ +│ ├── problem1/ # Sum to N implementations +│ ├── problem2/ # Token Exchange Application +│ └── problem3/ # Wallet Page refactoring +└── README.md +``` + +## Setup ## + +```bash +cd src/problem2 +npm install +npm run dev +``` diff --git a/src/problem1/.keep b/src/problem1/.keep deleted file mode 100644 index e69de29bb..000000000 diff --git a/src/problem1/index.js b/src/problem1/index.js new file mode 100644 index 000000000..4d93e713c --- /dev/null +++ b/src/problem1/index.js @@ -0,0 +1,21 @@ +var sum_to_n_a = function (n) { + // your code here + if (n <= 0) return 0; + let result = 0; + for (let i = 0; i <= n; i++) { + result += i; + } + return result; +}; + +var sum_to_n_b = function (n) { + // your code here + if (n <= 0) return 0; + return (n * (n + 1)) / 2; +}; + +var sum_to_n_c = function (n) { + // your code here + if (n <= 0) return 0; + return n + sum_to_n_c(n - 1); +}; diff --git a/src/problem2/index.html b/src/problem2/index.html index 4058a68bf..5eb6054c1 100644 --- a/src/problem2/index.html +++ b/src/problem2/index.html @@ -1,27 +1,16 @@ - - - - - Fancy Form - - - - - - - - -
-
Swap
- - - - - - - -
- - - + + + + + + + Currency Swap + + + + + +
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a/src/problem2/public/favicon.svg b/src/problem2/public/favicon.svg new file mode 100644 index 000000000..e7b8dfb1b --- /dev/null +++ b/src/problem2/public/favicon.svg @@ -0,0 +1 @@ + \ No newline at end of file diff --git a/src/problem2/script.js b/src/problem2/script.js deleted file mode 100644 index e69de29bb..000000000 diff --git a/src/problem2/src/App.css b/src/problem2/src/App.css new file mode 100644 index 000000000..47804f247 --- /dev/null +++ b/src/problem2/src/App.css @@ -0,0 +1,252 @@ +.app { + width: 100%; + max-width: 420px; +} + +.app--loading, +.app--error { + display: flex; + flex-direction: column; + align-items: center; + justify-content: center; + gap: 16px; + color: var(--text-muted); +} + +.loader { + width: 40px; + height: 40px; + border: 3px solid var(--border); + border-top-color: var(--accent); + border-radius: 50%; + animation: spin 0.8s linear infinite; +} + +@keyframes spin { + to { + transform: rotate(360deg); + } +} + +.error-card { + background: var(--bg-card); + border: 1px solid var(--border); + border-radius: var(--radius); + padding: 32px; + text-align: center; + max-width: 360px; +} + +.error-icon { + display: inline-flex; + align-items: center; + justify-content: center; + width: 48px; + height: 48px; + border-radius: 50%; + background: rgba(239, 68, 68, 0.15); + color: var(--error); + font-size: 1.5rem; + font-weight: 700; + margin-bottom: 16px; +} + +.error-card h2 { + margin: 0 0 8px; + font-size: 1.25rem; + font-weight: 600; + color: var(--text); +} + +.error-card p { + margin: 0; + font-size: 0.9375rem; + color: var(--text-muted); +} + +.swap-card { + background: var(--bg-card); + border: 1px solid var(--border); + border-radius: var(--radius); + overflow: hidden; +} + +.swap-header { + padding: 24px 24px 8px; +} + +.swap-header h1 { + margin: 0; + font-size: 1.5rem; + font-weight: 700; +} + +.swap-subtitle { + font-size: 0.875rem; + color: var(--text-muted); +} + +.swap-form { + padding: 8px 24px 24px; +} + +.input-group { + margin-bottom: 4px; +} + +.input-label { + display: block; + font-size: 0.8125rem; + color: var(--text-muted); + margin-bottom: 6px; +} + +.input-row { + display: flex; + align-items: center; + gap: 12px; + padding: 12px 16px; + background: var(--bg-elevated); + border: 1px solid var(--border); + border-radius: var(--radius-sm); + transition: border-color 0.2s, box-shadow 0.2s; +} + +.input-row:focus-within { + border-color: var(--border-focus); + box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15); +} + +.input-row .amount-input--error + .token-selector-trigger, +.input-row:has(.amount-input--error) { + border-color: var(--error); +} + +.field-error { + margin: 6px 0 0; + font-size: 0.8125rem; + color: var(--error); +} + +.swap-divider { + display: flex; + align-items: center; + justify-content: center; + gap: 12px; + padding: 4px 0; + margin: 4px 0; + position: relative; +} + +.swap-flip { + display: flex; + align-items: center; + justify-content: center; + width: 36px; + height: 36px; + background: var(--bg-elevated); + border: 1px solid var(--border); + border-radius: 50%; + color: var(--text-muted); + transition: background 0.2s, color 0.2s, transform 0.2s; + flex-shrink: 0; +} + +.swap-flip:hover { + background: var(--border); + color: var(--text); + transform: rotate(-180deg); +} + +.submit-btn { + width: 100%; + margin-top: 20px; + padding: 14px 24px; + background: var(--accent); + border: none; + border-radius: var(--radius-sm); + color: white; + font-size: 1rem; + font-weight: 600; + display: flex; + align-items: center; + justify-content: center; + gap: 10px; + transition: background 0.2s, transform 0.05s; +} + +.submit-btn:hover:not(:disabled) { + background: var(--accent-hover); +} + +.submit-btn:active:not(:disabled) { + transform: scale(0.99); +} + +.submit-btn:disabled { + opacity: 0.8; + cursor: not-allowed; +} + +.submit-spinner { + width: 18px; + height: 18px; + border: 2px solid rgba(255, 255, 255, 0.3); + border-top-color: white; + border-radius: 50%; + animation: spin 0.7s linear infinite; +} + +.success-msg { + margin: 12px 0 0; + font-size: 0.875rem; + color: var(--success); + text-align: center; +} + +/* Tablet: max-width 720px */ +@media (max-width: 720px) { + .app { + max-width: 100%; + } + + .swap-header { + padding: 20px 20px 6px; + } + + .swap-header h1 { + font-size: 1.375rem; + } + + .swap-form { + padding: 6px 20px 20px; + } + + .submit-btn { + margin-top: 16px; + padding: 12px 20px; + font-size: 0.9375rem; + } +} + +/* Mobile: max-width 480px */ +@media (max-width: 480px) { + .swap-header { + padding: 16px 16px 4px; + } + + .input-group { + margin-bottom: 2px; + } + + .input-label { + font-size: 0.75rem; + margin-bottom: 4px; + } + + .input-row { + padding: 10px 12px; + gap: 8px; + border-radius: 12px; + } +} diff --git a/src/problem2/src/App.jsx b/src/problem2/src/App.jsx new file mode 100644 index 000000000..2470e0037 --- /dev/null +++ b/src/problem2/src/App.jsx @@ -0,0 +1,167 @@ +import { useTokenSwap } from './hooks/useTokenSwap' +import { TokenSelector } from './components/TokenSelector' +import { AmountInput } from './components/AmountInput' +import { + PREFERRED_FROM_TOKEN, + PREFERRED_TO_TOKEN, + SUBMIT_DELAY_MS, +} from './constants' +import './App.css' + +function App() { + const { + tokens, + fromToken, + toToken, + fromAmount, + toAmount, + exchangeRate, + loadingPrices, + priceError, + fieldError, + isSubmitting, + submitSuccess, + setFromToken, + setToToken, + setFromAmount, + swapDirection, + submit, + } = useTokenSwap({ + preferredFrom: PREFERRED_FROM_TOKEN, + preferredTo: PREFERRED_TO_TOKEN, + submitDelayMs: SUBMIT_DELAY_MS, + }) + + if (loadingPrices) { + return ( +
+
+

Loading tokens and prices…

+
+ ) + } + + if (priceError) { + return ( +
+
+ ! +

Cannot load prices

+

{priceError}

+
+
+ ) + } + + if (tokens.length === 0) { + return ( +
+
+

No tokens with prices available.

+
+
+ ) + } + + return ( +
+
+
+

Swap

+

Exchange one asset for another

+
+ +
+
+ +
+ + +
+ {fieldError.from && ( +

{fieldError.from}

+ )} +
+ +
+ + {exchangeRate != null && ( +

+ 1 {fromToken} ≈ {exchangeRate < 0.0001 ? exchangeRate.toExponential(2) : exchangeRate.toFixed(6)} {toToken} +

+ )} +
+ +
+ +
+ + +
+ {fieldError.to && ( +

{fieldError.to}

+ )} +
+ + + + {submitSuccess && ( +

+ Swap complete. +

+ )} +
+
+
+ ) +} + +export default App diff --git a/src/problem2/src/api/prices.js b/src/problem2/src/api/prices.js new file mode 100644 index 000000000..f69184611 --- /dev/null +++ b/src/problem2/src/api/prices.js @@ -0,0 +1,26 @@ +import axios from 'axios' +import { PRICES_URL, TOKEN_ICON_BASE } from '../constants' + +export async function fetchTokenPrices() { + const { data } = await axios.get(PRICES_URL) + + const byCurrency = {}; + for (const row of data) { + const key = row.currency; + if (!byCurrency[key]) { + byCurrency[key] = { currency: key, price: row.price }; + } + } + + return Object.values(byCurrency) + .map(({ currency, price }) => ({ + currency, + price: Number(price), + iconUrl: `${TOKEN_ICON_BASE}/${currency}.svg`, + })) + .sort((a, b) => a.currency.localeCompare(b.currency)); +} + +export function getTokenIconUrl(currency) { + return `${TOKEN_ICON_BASE}/${currency}.svg`; +} diff --git a/src/problem2/src/components/AmountInput.css b/src/problem2/src/components/AmountInput.css new file mode 100644 index 000000000..2e47b6a14 --- /dev/null +++ b/src/problem2/src/components/AmountInput.css @@ -0,0 +1,40 @@ +.amount-input { + flex: 1; + min-width: 0; + background: transparent; + border: none; + color: var(--text); + font-size: 1.25rem; + font-weight: 600; + padding: 12px 0; + outline: none; +} + +.amount-input::placeholder { + color: var(--text-dim); +} + +.amount-input:disabled { + opacity: 0.85; + cursor: default; +} + +.amount-input--error { + color: var(--error); +} + +/* Tablet: max-width 720px */ +@media (max-width: 720px) { + .amount-input { + font-size: 1.125rem; + padding: 10px 0; + } +} + +/* Mobile: max-width 480px */ +@media (max-width: 480px) { + .amount-input { + font-size: 1rem; + padding: 8px 0; + } +} diff --git a/src/problem2/src/components/AmountInput.jsx b/src/problem2/src/components/AmountInput.jsx new file mode 100644 index 000000000..3bd677132 --- /dev/null +++ b/src/problem2/src/components/AmountInput.jsx @@ -0,0 +1,30 @@ +import './AmountInput.css' + +export function AmountInput({ + value, + onChange, + placeholder = '0.0', + readOnly, + disabled, + error, + className = '', +}) { + const handleChange = (e) => { + const v = e.target.value + if (/^$|^\.?\d*\.?\d*$/.test(v)) onChange(v) + } + + return ( + + ) +} diff --git a/src/problem2/src/components/TokenSelector.css b/src/problem2/src/components/TokenSelector.css new file mode 100644 index 000000000..212e742c7 --- /dev/null +++ b/src/problem2/src/components/TokenSelector.css @@ -0,0 +1,212 @@ +.token-selector { + position: relative; +} + +.token-selector-trigger { + display: flex; + align-items: center; + gap: 8px; + padding: 8px 12px; + background: var(--bg-elevated); + border: 1px solid var(--border); + border-radius: var(--radius-sm); + color: var(--text); + font-size: 0.9375rem; + font-weight: 600; + min-width: 120px; + transition: + border-color 0.15s, + background 0.15s; +} + +.token-selector-placeholder { + color: var(--text-dim); + font-weight: 500; +} + +.token-icon { + width: 24px; + height: 24px; + border-radius: 50%; + object-fit: cover; +} + +.token-icon--fallback { + background: var(--border); + display: flex; + align-items: center; + justify-content: center; + font-size: 10px; + font-weight: 700; + color: var(--text-muted); +} + +.token-selector-symbol { + flex: 1; + text-align: left; +} + +.token-selector-chevron { + flex-shrink: 0; + opacity: 0.7; + transition: transform 0.2s; +} + +.token-selector-trigger[aria-expanded="true"] .token-selector-chevron { + transform: rotate(180deg); +} + +.token-selector-backdrop { + position: fixed; + inset: 0; + z-index: 10; +} + +.token-selector-dropdown { + position: absolute; + top: calc(100% + 8px); + width: 200px; + right: 0; + z-index: 20; + background: var(--bg-elevated); + border: 1px solid var(--border); + border-radius: var(--radius-sm); + box-shadow: var(--shadow); + max-height: 280px; + min-height: 0; + display: flex; + flex-direction: column; + overflow: hidden; +} + +.token-selector-search { + padding: 8px; + border-bottom: 1px solid var(--border); +} + +.token-selector-search-input { + width: 100%; + padding: 10px 12px; + background: var(--bg-card); + border: 1px solid var(--border); + border-radius: 8px; + color: var(--text); + font-size: 0.875rem; + outline: none; +} + +.token-selector-search-input::placeholder { + color: var(--text-dim); +} + +.token-selector-search-input:focus { + border-color: var(--accent); +} + +.token-selector-list { + list-style: none; + margin: 0; + padding: 4px; + padding-inline-start: 0; + overflow-y: auto; + overflow-x: hidden; + max-height: 220px; + min-height: 0; + background: var(--bg-elevated); + position: relative; + z-index: 1; +} + +.token-selector-option { + display: flex; + align-items: center; + gap: 10px; + width: 100%; + padding: 10px 12px; + background: transparent; + border: none; + border-radius: 8px; + color: var(--text); + font-size: 0.9375rem; + text-align: left; + cursor: pointer; + transition: background 0.15s; +} + +.token-selector-option:hover { + background: rgba(255, 255, 255, 0.06); +} + +.token-selector-option:focus-visible { + outline: 2px solid var(--accent); + outline-offset: -2px; +} + +.token-selector-option .token-icon { + width: 28px; + height: 28px; +} + +.token-option-symbol { + flex: 1; + font-weight: 600; +} + +.token-option-price { + font-size: 0.8125rem; + color: var(--text-muted); +} + +.token-selector-empty { + padding: 20px; + text-align: center; + color: var(--text-muted); + font-size: 0.875rem; +} + +/* Tablet: max-width 720px */ +@media (max-width: 720px) { + .token-selector-trigger { + min-width: 100px; + padding: 6px 10px; + font-size: 0.875rem; + } + + .token-icon { + width: 22px; + height: 22px; + } + + .token-selector-dropdown { + max-height: 260px; + } + + .token-selector-list { + max-height: 200px; + } +} + +/* Mobile: max-width 480px */ +@media (max-width: 480px) { + .token-selector-trigger { + min-width: 88px; + padding: 6px 8px; + font-size: 0.8125rem; + gap: 6px; + } + + .token-icon { + width: 20px; + height: 20px; + } + + .token-selector-option { + padding: 8px 10px; + font-size: 0.875rem; + } + + .token-selector-option .token-icon { + width: 15px; + height: 15px; + } +} diff --git a/src/problem2/src/components/TokenSelector.jsx b/src/problem2/src/components/TokenSelector.jsx new file mode 100644 index 000000000..d5925b367 --- /dev/null +++ b/src/problem2/src/components/TokenSelector.jsx @@ -0,0 +1,131 @@ +import { useState, useRef, useEffect } from 'react' +import './TokenSelector.css' + +const TOKEN_ICON_BASE = 'https://raw.githubusercontent.com/Switcheo/token-icons/main/tokens' + +function TokenIcon({ currency, className = '' }) { + const [failed, setFailed] = useState(false) + const src = `${TOKEN_ICON_BASE}/${currency}.svg` + if (failed) { + return ( + + {currency.slice(0, 2)} + + ) + } + return ( + setFailed(true)} + /> + ) +} + +export function TokenSelector({ tokens, value, onChange, disabled }) { + const [open, setOpen] = useState(false) + const [search, setSearch] = useState('') + const listRef = useRef(null) + + const filtered = search.trim() + ? tokens.filter((t) => + t.currency.toLowerCase().includes(search.trim().toLowerCase()) + ) + : tokens + + useEffect(() => { + if (!open) setSearch('') + }, [open]) + + useEffect(() => { + if (!open) return + const el = listRef.current + if (!el) return + const selected = el.querySelector('[data-selected]') + if (selected) selected.scrollIntoView({ block: 'nearest' }) + }, [open, value]) + + const selectedToken = tokens.find((t) => t.currency === value) + + return ( +
+ + + {open && ( + <> +
setOpen(false)} + /> +
+
+ setSearch(e.target.value)} + className="token-selector-search-input" + autoFocus + aria-label="Search token" + /> +
+
    + {filtered.length === 0 ? ( +
  • No token found
    • + ) : ( + filtered.map((token) => ( +
  • + +
    • + )) + )} +
+
+ + )} +
+ ) +} diff --git a/src/problem2/src/constants/index.js b/src/problem2/src/constants/index.js new file mode 100644 index 000000000..0dc928c57 --- /dev/null +++ b/src/problem2/src/constants/index.js @@ -0,0 +1,9 @@ +// API +export const PRICES_URL = 'https://interview.switcheo.com/prices.json' +export const TOKEN_ICON_BASE = + 'https://raw.githubusercontent.com/Switcheo/token-icons/main/tokens' + +// DEFAULT VALUES +export const SUBMIT_DELAY_MS = 2200 +export const PREFERRED_FROM_TOKEN = 'ETH' +export const PREFERRED_TO_TOKEN = 'USD' diff --git a/src/problem2/src/hooks/useTokenSwap.js b/src/problem2/src/hooks/useTokenSwap.js new file mode 100644 index 000000000..a777a416b --- /dev/null +++ b/src/problem2/src/hooks/useTokenSwap.js @@ -0,0 +1,132 @@ +import { useState, useEffect, useMemo, useCallback } from 'react' +import { fetchTokenPrices } from '../api/prices' +import { getExchangeRate, formatToAmount } from '../util/swap' +import { + SUBMIT_DELAY_MS, + PREFERRED_FROM_TOKEN, + PREFERRED_TO_TOKEN, +} from '../constants' + +export function useTokenSwap(options = {}) { + const { + submitDelayMs = SUBMIT_DELAY_MS, + preferredFrom = PREFERRED_FROM_TOKEN, + preferredTo = PREFERRED_TO_TOKEN, + } = options + + const [tokens, setTokens] = useState([]) + const [loadingPrices, setLoadingPrices] = useState(true) + const [priceError, setPriceError] = useState(null) + + const [fromToken, setFromToken] = useState('') + const [toToken, setToToken] = useState('') + const [fromAmount, setFromAmount] = useState('') + const [fieldError, setFieldError] = useState({ from: null, to: null }) + const [isSubmitting, setIsSubmitting] = useState(false) + const [submitSuccess, setSubmitSuccess] = useState(false) + + useEffect(() => { + let cancelled = false + fetchTokenPrices() + .then((list) => { + if (!cancelled) { + setTokens(list) + if (list.length >= 2) { + const from = list.find((t) => t.currency === preferredFrom) ?? list[0] + const to = list.find((t) => t.currency === preferredTo) ?? list[1] + setFromToken(from.currency) + setToToken(to.currency) + } + } + }) + .catch((err) => { + if (!cancelled) setPriceError(err.message || 'Failed to load prices') + }) + .finally(() => { + if (!cancelled) setLoadingPrices(false) + }) + return () => { cancelled = true } + }, [preferredFrom, preferredTo]) + + const exchangeRate = useMemo( + () => (fromToken && toToken ? getExchangeRate(tokens, fromToken, toToken) : null), + [tokens, fromToken, toToken] + ) + + const toAmount = useMemo(() => { + if (!exchangeRate || fromAmount === '' || fromAmount === '.') return '' + const num = parseFloat(fromAmount) + if (Number.isNaN(num)) return '' + return formatToAmount(num * exchangeRate) + }, [fromAmount, exchangeRate]) + + const setFromAmountWithReset = useCallback((value) => { + setFromAmount(value) + setFieldError((e) => ({ ...e, from: null })) + setSubmitSuccess(false) + }, []) + + const swapDirection = useCallback(() => { + setFromToken(toToken) + setToToken(fromToken) + setFromAmount('') + setFieldError({ from: null, to: null }) + setSubmitSuccess(false) + }, [fromToken, toToken]) + + const validate = useCallback(() => { + const num = parseFloat(fromAmount) + const fromErr = + fromAmount === '' + ? 'Enter an amount' + : Number.isNaN(num) + ? 'Enter a valid number' + : num <= 0 + ? 'Amount must be greater than 0' + : null + const toErr = fromToken === toToken ? 'Choose two different tokens' : null + setFieldError({ from: fromErr, to: toErr }) + return !fromErr && !toErr + }, [fromAmount, fromToken, toToken]) + + const submit = useCallback( + (e) => { + e?.preventDefault() + if (!validate()) return + setIsSubmitting(true) + setSubmitSuccess(false) + setTimeout(() => { + setIsSubmitting(false) + setSubmitSuccess(true) + }, submitDelayMs) + }, + [validate, submitDelayMs] + ) + + return { + // Data + tokens, + fromToken, + toToken, + fromAmount, + toAmount, + exchangeRate, + + // Loading & errors + loadingPrices, + priceError, + fieldError, + isSubmitting, + submitSuccess, + + // Setters + setFromToken, + setToToken, + setFromAmount: setFromAmountWithReset, + + // Actions + swapDirection, + validate, + submit, + } +} diff --git a/src/problem2/src/index.css b/src/problem2/src/index.css new file mode 100644 index 000000000..b5522a356 --- /dev/null +++ b/src/problem2/src/index.css @@ -0,0 +1,67 @@ +:root { + --bg-deep: #0a0b0f; + --bg-card: #12141c; + --bg-elevated: #1a1d28; + --border: #2a2e3d; + --border-focus: #6366f1; + --text: #f1f5f9; + --text-muted: #94a3b8; + --text-dim: #64748b; + --accent: #6366f1; + --accent-hover: #818cf8; + --success: #22c55e; + --error: #ef4444; + --radius: 16px; + --radius-sm: 10px; + --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5); + --font-sans: 'DM Sans', system-ui, sans-serif; + --font-mono: 'JetBrains Mono', monospace; +} + +* { + box-sizing: border-box; +} + +body { + margin: 0; + min-height: 100vh; + font-family: var(--font-sans); + background: var(--bg-deep); + color: var(--text); + -webkit-font-smoothing: antialiased; + -moz-osx-font-smoothing: grayscale; +} + +#root { + min-height: 100vh; + display: flex; + align-items: center; + justify-content: center; + padding: 24px; +} + +button { + font-family: inherit; + cursor: pointer; +} + +input { + font-family: inherit; +} + +input::placeholder { + color: var(--text-dim); +} + +@media (max-width: 720px) { + #root { + padding: 16px; + } +} + +@media (max-width: 480px) { + #root { + padding: 12px; + align-items: flex-start; + } +} diff --git a/src/problem2/src/main.jsx b/src/problem2/src/main.jsx new file mode 100644 index 000000000..5cc599199 --- /dev/null +++ b/src/problem2/src/main.jsx @@ -0,0 +1,10 @@ +import React from 'react' +import ReactDOM from 'react-dom/client' +import App from './App' +import './index.css' + +ReactDOM.createRoot(document.getElementById('root')).render( + + + , +) diff --git a/src/problem2/src/util/swap.js b/src/problem2/src/util/swap.js new file mode 100644 index 000000000..ab52385bd --- /dev/null +++ b/src/problem2/src/util/swap.js @@ -0,0 +1,11 @@ +export function getExchangeRate(tokens, fromCurrency, toCurrency) { + const from = tokens.find((t) => t.currency === fromCurrency) + const to = tokens.find((t) => t.currency === toCurrency) + if (!from || !to) return null + return from.price && to.price ? to.price / from.price : null +} + +export function formatToAmount(value) { + if (value < 1e-12) return '0' + return value.toFixed(8).replace(/\.?0+$/, '') +} diff --git a/src/problem2/style.css b/src/problem2/style.css deleted file mode 100644 index 915af91c7..000000000 --- a/src/problem2/style.css +++ /dev/null @@ -1,8 +0,0 @@ -body { - display: flex; - flex-direction: row; - align-items: center; - justify-content: center; - min-width: 360px; - font-family: Arial, Helvetica, sans-serif; -} diff --git a/src/problem2/vite.config.js b/src/problem2/vite.config.js new file mode 100644 index 000000000..7727ce9a7 --- /dev/null +++ b/src/problem2/vite.config.js @@ -0,0 +1,11 @@ +import { defineConfig } from 'vite' +import react from '@vitejs/plugin-react' +import path from 'path' +import { fileURLToPath } from 'url' + +const __dirname = path.dirname(fileURLToPath(import.meta.url)) + +export default defineConfig({ + plugins: [react()], + root: __dirname, +}) diff --git a/src/problem3/.keep b/src/problem3/.keep deleted file mode 100644 index e69de29bb..000000000 diff --git a/src/problem3/problem3.tsx b/src/problem3/problem3.tsx new file mode 100644 index 000000000..afee6adee --- /dev/null +++ b/src/problem3/problem3.tsx @@ -0,0 +1,85 @@ +interface WalletBalance { + currency: string; + amount: number; + // 1. missing blockchain propperty +} +interface FormattedWalletBalance { + currency: string; + amount: number; + formatted: string; +} + +interface Props extends BoxProps {} +const WalletPage: React.FC = (props: Props) => { + const { children, ...rest } = props; + const balances = useWalletBalances(); + const prices = usePrices(); + + // 2. use any type - not safety type + const getPriority = (blockchain: any): number => { + switch (blockchain) { + case "Osmosis": + return 100; + case "Ethereum": + return 50; + case "Arbitrum": + return 30; + case "Zilliqa": + return 20; + case "Neo": + return 20; + default: + return -99; + } + }; + + const sortedBalances = useMemo(() => { + return balances + .filter((balance: WalletBalance) => { + const balancePriority = getPriority(balance.blockchain); + if (lhsPriority > -99) { + // 3. defined balancePriority but used lhsPriority + if (balance.amount <= 0) { + // 4. keeps zero or negative balances, should be positive value + return true; + } + } + return false; + }) + .sort((lhs: WalletBalance, rhs: WalletBalance) => { + const leftPriority = getPriority(lhs.blockchain); + const rightPriority = getPriority(rhs.blockchain); + if (leftPriority > rightPriority) { + return -1; + } else if (rightPriority > leftPriority) { + return 1; + } + // 5. if priorities are equal then returns undefined + }); + }, [balances, prices]); // 6. dependency price is not used + + // 7.formattedBalances declare but not used + const formattedBalances = sortedBalances.map((balance: WalletBalance) => { + return { + ...balance, + formatted: balance.amount.toFixed(), + }; + }); + + const rows = sortedBalances.map( + (balance: FormattedWalletBalance, index: number) => { + const usdValue = prices[balance.currency] * balance.amount; // 8. prices[balance.currency] may be undefined + return ( + + ); + } + ); + + return
{rows}
; +}; diff --git a/src/problem3/refactored.tsx b/src/problem3/refactored.tsx new file mode 100644 index 000000000..3118a05bd --- /dev/null +++ b/src/problem3/refactored.tsx @@ -0,0 +1,102 @@ +import React, { useMemo } from "react"; + +// Fix: add Blockchain defination type +type Blockchain = "Osmosis" | "Ethereum" | "Arbitrum" | "Zilliqa" | "Neo"; + +interface WalletBalance { + currency: string; + amount: number; + blockchain: Blockchain; // Fix: add missing blockchain property +} + +interface FormattedWalletBalance extends WalletBalance { + formatted: string; +} + +interface WalletPageProps { + children?: React.ReactNode; + className?: string; +} + +// Fix: use Map instead of switch statement +const PRIORITY_MAP: Record = { + Osmosis: 100, + Ethereum: 50, + Arbitrum: 30, + Zilliqa: 20, + Neo: 20, +}; + +const WalletRow: React.FC<{ + amount: number; + usdValue: number; + formattedAmount: string; +}> = ({ formattedAmount, usdValue }) => ( +
+ {formattedAmount} + ${usdValue.toFixed(2)} +
+); + +const WalletPage: React.FC = ({ + children, + className, + ...rest +}) => { + const balances = useWalletBalances(); + const prices = usePrices(); + + const formattedBalances = useMemo(() => { + return ( + balances + // Fix: keep positive amounts with valid priority + .filter( + (balance: WalletBalance) => + balance.amount > 0 && PRIORITY_MAP[balance.blockchain] !== undefined + ) + + // Fix: correct condition sort + .sort((lhs: WalletBalance, rhs: WalletBalance) => { + const leftPriority = PRIORITY_MAP[lhs.blockchain] ?? -99; + const rightPriority = PRIORITY_MAP[rhs.blockchain] ?? -99; + + if (leftPriority !== rightPriority) { + return rightPriority - leftPriority; + } + + return rhs.amount - lhs.amount; + }) + // Fix: redundant iteration, combine map with formatted + .map((balance: FormattedWalletBalance) => ({ + ...balance, + formatted: balance.amount.toFixed(2), + })) + ); + }, [balances]); // Fix: dependency prices is not used + + // Fix: Memoize rows and use unique keys, not use index + const rows = useMemo(() => { + return formattedBalances.map((balance: FormattedWalletBalance) => { + // Fix: prices[balance.currency] may be undefined + const price = prices[balance.currency] ?? 0; + const usdValue = price * balance.amount; + + return ( + + ); + }); + }, [formattedBalances, prices]); + + return ( +
+ {children} + {rows} +
+ ); +}; diff --git a/src/problem4/.keep b/src/problem4/.keep deleted file mode 100644 index e69de29bb..000000000 diff --git a/src/problem5/.keep b/src/problem5/.keep deleted file mode 100644 index e69de29bb..000000000