feat: Investment Calculator (#784)

packages/kitchen-sink/src/examples/investment-calculator.tsx

@@ -0,0 +1,83 @@
+import { useState } from 'react';
+import { block } from 'million/react';
+
+interface Results {
+    totalInvestment: number;
+    totalPayment: number;
+    totalInterest: number;
+}
+
+const InvestmentCalculator = block(() => {
+    const [investmentAmount, setInvestmentAmount] = useState<number | string>('');
+    const [interestRate, setInterestRate] = useState<number | string>('');
+    const [numberOfYears, setNumberOfYears] = useState<number | string>('');
+    const [results, setResults] = useState<Results | null>(null);
+
+
+    const calculateInterest = ()=>{
+        const p = parseFloat(investmentAmount as string);
+        const r = parseFloat(interestRate as string);
+        const n = parseInt(numberOfYears as string, 10);
+
+        if (isNaN(p) || isNaN(r) || isNaN(n) || p <= 0 || r <= 0 || n <= 0) {
+        alert('Please enter valid numbers.');
+        return;
+        }
+
+        const totalInterest = (p*r*n)/100;
+        const totalPayment = totalInterest + p;
+        const totalInvestment = p;
+
+        setResults({
+        totalInvestment,
+        totalPayment,
+        totalInterest,
+        });
+    }
+
+
+  return (
+    <div className="InvestmentCalculator">
+    <h1>Investment Calculator</h1>
+    <div>
+        <label>Total Investment ($): </label>
+        <input
+        type="number"
+        value={investmentAmount}
+        onChange={(e) => setInvestmentAmount(e.target.value)}
+        style={{ display: 'block', marginBottom: '15px' }}
+        />
+    </div>
+    <div>
+        <label>Interest Rate (Annual %): </label>
+        <input
+        type="number"
+        value={interestRate}
+        onChange={(e) => setInterestRate(e.target.value)}
+        style={{ display: 'block', marginBottom: '15px' }}
+        />
+    </div>
+    <div>
+        <label>Duration (Years): </label>
+        <input
+        type="number"
+        value={numberOfYears}
+        onChange={(e) => setNumberOfYears(e.target.value)}
+        style={{ display: 'block', marginBottom: '15px' }}
+        />
+    </div>
+    <button onClick={calculateInterest}>Calculate</button>
+
+    {results && (
+        <div className="results">
+        <h2>Results:</h2>
+        <div>End Balance: ${results.totalPayment.toFixed(2)}</div>
+        <div>Total Investment : ${results.totalInvestment.toFixed(2)}</div>
+        <div>Total Interest: ${results.totalInterest.toFixed(2)}</div>
+        </div>
+    )}
+    </div>
+);
+});
+
+export default InvestmentCalculator;