diff --git a/.gitignore b/.gitignore new file mode 100644 index 000000000..600e365ec --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +**/node_modules \ No newline at end of file diff --git a/src/problem1/code.md b/src/problem1/code.md new file mode 100644 index 000000000..4156587db --- /dev/null +++ b/src/problem1/code.md @@ -0,0 +1,20 @@ +```javascript +var sum_to_n_a = function(n) { + if (n <= 0) return 0; + return n * (n + 1) / 2; +}; + +var sum_to_n_b = function(n) { + if (n <= 0) return 0; + var sum = 0; + for (var i = 1; i <= n; i++) { + sum += i; + } + return sum; +}; + +var sum_to_n_c = function(n) { + 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..b3b699087 100644 --- a/src/problem2/index.html +++ b/src/problem2/index.html @@ -1,27 +1,13 @@ - - - - - Fancy Form - - - - - - - - -
-
Swap
- - - - - - - -
- - - + + + + + + + Currency Swap + + +
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"sugarss": { + "optional": true + }, + "terser": { + "optional": true + }, + "tsx": { + "optional": true + }, + "yaml": { + "optional": true + } + } + } + } +} diff --git a/src/problem2/package.json b/src/problem2/package.json new file mode 100644 index 000000000..2ec0b1531 --- /dev/null +++ b/src/problem2/package.json @@ -0,0 +1,16 @@ +{ + "name": "swap", + "private": true, + "version": "0.0.0", + "type": "module", + "scripts": { + "dev": "vite", + "build": "vite build", + "preview": "vite preview" + }, + "devDependencies": { + "@tailwindcss/vite": "^4.1.18", + "tailwindcss": "^4.1.18", + "vite": "^7.2.4" + } +} diff --git a/src/problem2/public/vite.svg b/src/problem2/public/vite.svg new file mode 100644 index 000000000..e7b8dfb1b --- /dev/null +++ b/src/problem2/public/vite.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/javascript.svg b/src/problem2/src/javascript.svg new file mode 100644 index 000000000..f9abb2b72 --- /dev/null +++ b/src/problem2/src/javascript.svg @@ -0,0 +1 @@ + \ No newline at end of file diff --git a/src/problem2/src/main.js b/src/problem2/src/main.js new file mode 100644 index 000000000..59222f0dd --- /dev/null +++ b/src/problem2/src/main.js @@ -0,0 +1,288 @@ +import './style.css' + +const PRICES_URL = 'https://interview.switcheo.com/prices.json' +const ICON_BASE = 'https://raw.githubusercontent.com/Switcheo/token-icons/main/tokens/' + +const state = { + prices: new Map(), // symbol -> price (USD) + tokens: [], // [{symbol, price}] + from: 'USDC', + to: 'SWTH', + amountFrom: '', + loading: false, + error: '', +} + +const app = document.querySelector('#app') +app.innerHTML = ` +
+
+
+
+

Swap

+
+ + + +
+
+
+ From + +
+
+ + +
+
+ Balance: 1,000.00 + ≈ $0.00 +
+
+ +
+ +
+ +
+
+ To + +
+
+ + +
+
+   + ≈ $0.00 +
+
+
+ +
+ +

Includes mock network fee. This is a simulated swap.

+
+
+
+ + +
+` + +const els = { + alert: document.getElementById('alert'), + fromTokenBtn: document.getElementById('fromTokenBtn'), + toTokenBtn: document.getElementById('toTokenBtn'), + fromTokenLabel: document.getElementById('fromTokenLabel'), + toTokenLabel: document.getElementById('toTokenLabel'), + fromTokenIcon: document.getElementById('fromTokenIcon'), + toTokenIcon: document.getElementById('toTokenIcon'), + fromAmount: document.getElementById('fromAmount'), + toAmount: document.getElementById('toAmount'), + swapBtn: document.getElementById('swapBtn'), + maxBtn: document.getElementById('maxBtn'), + confirmBtn: document.getElementById('confirmBtn'), + confirmLabel: document.getElementById('confirmLabel'), + btnSpinner: document.getElementById('btnSpinner'), + rateLabel: document.getElementById('rateLabel'), + fromValueUSD: document.getElementById('fromValueUSD'), + toValueUSD: document.getElementById('toValueUSD'), + fromBalance: document.getElementById('fromBalance'), + tokenModal: document.getElementById('tokenModal'), + tokenSearch: document.getElementById('tokenSearch'), + tokenList: document.getElementById('tokenList'), + closeModal: document.getElementById('closeModal'), +} + +let selecting = null // 'from' | 'to' + +function showError(msg) { + els.alert.textContent = msg + els.alert.classList.remove('hidden') +} +function clearError() { + els.alert.classList.add('hidden') + els.alert.textContent = '' +} +function setIcon(el, symbol) { + const url = `${ICON_BASE}${encodeURIComponent(symbol)}.svg` + el.src = url + el.onerror = () => { + el.src = 'data:image/svg+xml;utf8,' + encodeURIComponent(`${symbol.slice(0,3)}`) + } +} +function fmt(n, d=6) { + if (!isFinite(n)) return '0' + const str = Number(n).toFixed(d) + return str.replace(/\.?0+$/,'') +} +function fmtUSD(n) { + const f = new Intl.NumberFormat(undefined, { style: 'currency', currency: 'USD', maximumFractionDigits: 2 }) + return f.format(Number(n) || 0) +} + +async function fetchPrices() { + const res = await fetch(PRICES_URL) + const arr = await res.json() + const latest = new Map() + for (const item of arr) { + latest.set(item.currency, { price: item.price, date: new Date(item.date).getTime() }) + } + const tokens = [] + for (const [symbol, { price }] of latest.entries()) { + if (typeof price === 'number' && isFinite(price)) { + tokens.push({ symbol, price }) + } + } + tokens.sort((a,b)=>a.symbol.localeCompare(b.symbol)) + state.tokens = tokens + state.prices = new Map(tokens.map(t=>[t.symbol, t.price])) + if (!state.prices.has(state.from)) state.from = tokens[0]?.symbol || 'USD' + if (!state.prices.has(state.to)) state.to = tokens[1]?.symbol || state.from + refreshTokens() + recompute() +} + +function refreshTokens() { + els.fromTokenLabel.textContent = state.from + els.toTokenLabel.textContent = state.to + setIcon(els.fromTokenIcon, state.from) + setIcon(els.toTokenIcon, state.to) +} + +function rate() { + const pFrom = state.prices.get(state.from) + const pTo = state.prices.get(state.to) + if (!pFrom || !pTo) return 0 + return pFrom / pTo +} + +function recompute() { + clearError() + const amt = parseFloat(state.amountFrom) + const pFrom = state.prices.get(state.from) + const pTo = state.prices.get(state.to) + const invalid = !pFrom || !pTo || !isFinite(amt) || amt <= 0 || state.from === state.to + els.confirmBtn.disabled = invalid || state.loading + if (state.from === state.to) { + showError('Please select two different tokens.') + } else if (!isFinite(amt) || amt <= 0) { + showError('Enter a valid amount greater than zero.') + } else if (!pFrom || !pTo) { + showError('Selected token price is unavailable.') + } + const r = rate() + els.rateLabel.textContent = r ? `1 ${state.from} = ${fmt(r,6)} ${state.to}` : '' + const out = isFinite(amt) ? amt * r : 0 + els.toAmount.value = fmt(out,6) + const usdFrom = (pFrom || 0) * (isFinite(amt) ? amt : 0) + const usdTo = (pTo || 0) * out + els.fromValueUSD.textContent = `≈ ${fmtUSD(usdFrom)}` + els.toValueUSD.textContent = `≈ ${fmtUSD(usdTo)}` +} + +function openTokenModal(which) { + selecting = which + els.tokenModal.classList.remove('hidden') + els.tokenModal.classList.add('flex') + els.tokenSearch.value = '' + renderTokenList('') +} +function closeTokenModal() { + els.tokenModal.classList.add('hidden') + els.tokenModal.classList.remove('flex') +} +function renderTokenList(q) { + const query = (q || '').trim().toLowerCase() + const items = state.tokens.filter(t => t.symbol.toLowerCase().includes(query)) + els.tokenList.innerHTML = items.map(t => ` + + `).join('') +} + +els.tokenList.addEventListener('click', (e) => { + const btn = e.target.closest('button[data-symbol]') + if (!btn) return + const sym = btn.getAttribute('data-symbol') + if (selecting === 'from') state.from = sym + else if (selecting === 'to') state.to = sym + refreshTokens() + closeTokenModal() + recompute() +}) +els.tokenSearch.addEventListener('input', (e) => renderTokenList(e.target.value)) +els.closeModal.addEventListener('click', closeTokenModal) + +els.fromTokenBtn.addEventListener('click', () => openTokenModal('from')) +els.toTokenBtn.addEventListener('click', () => openTokenModal('to')) +els.swapBtn.addEventListener('click', () => { + const tmp = state.from + state.from = state.to + state.to = tmp + refreshTokens() + recompute() +}) +els.maxBtn.addEventListener('click', () => { + state.amountFrom = '1000' + els.fromAmount.value = state.amountFrom + recompute() +}) +els.fromAmount.addEventListener('input', (e) => { + state.amountFrom = e.target.value.replace(/[^\d.]/g,'') + e.target.value = state.amountFrom + recompute() +}) + +els.confirmBtn.addEventListener('click', async () => { + state.loading = true + els.confirmBtn.disabled = true + els.btnSpinner.classList.remove('hidden') + els.confirmLabel.textContent = 'Swapping…' + clearError() + await new Promise(r => setTimeout(r, 1500)) + els.btnSpinner.classList.add('hidden') + els.confirmLabel.textContent = 'Swap Complete ✓' + await new Promise(r => setTimeout(r, 1200)) + state.loading = false + els.confirmLabel.textContent = 'Confirm Swap' + recompute() +}) + +fetchPrices().catch(() => showError('Failed to load prices. Please try again.')) diff --git a/src/problem2/src/style.css b/src/problem2/src/style.css new file mode 100644 index 000000000..f1d8c73cd --- /dev/null +++ b/src/problem2/src/style.css @@ -0,0 +1 @@ +@import "tailwindcss"; 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..fb0cdf00b --- /dev/null +++ b/src/problem2/vite.config.js @@ -0,0 +1,6 @@ +import { defineConfig } from 'vite' +import tailwindcss from '@tailwindcss/vite' + +export default defineConfig({ + plugins: [tailwindcss()], +}) diff --git a/src/problem3/WalletPage.tsx b/src/problem3/WalletPage.tsx new file mode 100644 index 000000000..d12f5db36 --- /dev/null +++ b/src/problem3/WalletPage.tsx @@ -0,0 +1,127 @@ +import { useMemo } from "react"; + +// functional programming section + +function pipe(fn1: (a: A) => B): (a: A) => B; +function pipe(fn1: (a: A) => B, fn2: (b: B) => C): (a: A) => C; +function pipe( + fn1: (a: A) => B, + fn2: (b: B) => C, + fn3: (c: C) => D, +): (a: A) => D; +function pipe( + fn1: (a: A) => B, + fn2: (b: B) => C, + fn3: (c: C) => D, + fn4: (d: D) => E, +): (a: A) => E; +function pipe( + fn1: (a: A) => B, + fn2: (b: B) => C, + fn3: (c: C) => D, + fn4: (d: D) => E, + fn5: (e: E) => F, +): (a: A) => F; +function pipe(...fns: Array<(arg: unknown) => unknown>) { + return (arg: unknown) => fns.reduce((acc, fn) => fn(acc), arg); +} + +const PRIORITY = { + Osmosis: 100, + Ethereum: 50, + Arbitrum: 30, + Zilliqa: 20, + Neo: 20, +} as const; + +type PriorityMap = typeof PRIORITY; + +type Blockchain = keyof PriorityMap; + +interface WalletBalance { + blockchain: Blockchain; + currency: string; + amount: number; +} +interface FormattedWalletBalance extends WalletBalance { + formatted: string; +} + +interface BalanceWithUSD extends FormattedWalletBalance { + usdValue: number; +} + +interface Props extends BoxProps {} + +const filterBalancesWithPriority = ( + list: WalletBalance[], + priorityMap: PriorityMap = PRIORITY, +): WalletBalance[] => { + return list.filter((b) => { + const priority = priorityMap[b.blockchain]; + if (priority > -99) { + return b.amount > 0; + } + return false; + }); +}; + +const sortBalances = ( + list: WalletBalance[], + priorityMap: PriorityMap = PRIORITY, +): WalletBalance[] => { + return list.sort((lhs: WalletBalance, rhs: WalletBalance) => { + const leftPriority = priorityMap[lhs.blockchain]; + const rightPriority = priorityMap[rhs.blockchain]; + return rightPriority - leftPriority; + }); +}; + +const formatBalances = (list: WalletBalance[]): FormattedWalletBalance[] => { + return list.map((balance: WalletBalance) => { + return { + ...balance, + formatted: balance.amount.toFixed(2), + }; + }); +}; + +const addUsdValue = + (prices: Record) => + (list: FormattedWalletBalance[]): BalanceWithUSD[] => + list.map((balance) => ({ + ...balance, + usdValue: prices[balance.currency] * balance.amount, + })); + +const renderWalletRows = (list: BalanceWithUSD[]) => + list.map((balance: BalanceWithUSD, index: number) => ( + + )); + +const WalletPage = (props: Props) => { + const { ...rest } = props; + const balances = useWalletBalances(); + const prices = usePrices(); + + const formattedBalances = useMemo(() => { + return pipe( + filterBalancesWithPriority, + sortBalances, + formatBalances, + )(balances); + }, [balances]); + + const rows = useMemo( + () => pipe(addUsdValue(prices), renderWalletRows)(formattedBalances), + [formattedBalances, prices], + ); + + return
{rows}
; +}; diff --git a/src/problem3/explain.md b/src/problem3/explain.md new file mode 100644 index 000000000..0805b9d74 --- /dev/null +++ b/src/problem3/explain.md @@ -0,0 +1,12 @@ +Problem 3: Wallet Page + +1. Missing typing system and has any type. +2. Interface do not inherit at the right way. +3. Switch function don't have an issue. But I prefer to use a map object to handle the case. +4. React.FC is redundant when the component do not have children prop. +5. Using chain function to handle the data flow make it hard to read and debug. +6. The component is not testable. I would prefer to use a pure function to handle the data flow. +7. Do not clean up the memo dependency array. It will cause the component to re-render when the dependency change. +8. Using index as key is not a good practice. It will cause the component to re-render when the item order change. +9. The component should be split into smaller component. WalletRow is a good candidate. +10. I'm using functional programming to handle the data flow. It makes the code more readable and testable. \ No newline at end of file