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ã³ãŒãäŸ
```javascript async function convertCurrency(amount, fromCurrency, toCurrency, apiKey) { const apiUrl = `https://api.example.com/convert?from=${fromCurrency}&to=${toCurrency}&amount=${amount}&apiKey=${apiKey}`; try { const response = await fetch(apiUrl); if (!response.ok) { throw new Error(`HTTP error! Status: ${response.status}`); } const data = await response.json(); if (data.error) { throw new Error(data.error); } return data.result; } catch (error) { console.error("Error fetching exchange rate:", error); return null; // Or handle the error appropriately } } // Example usage: const apiKey = "YOUR_API_KEY"; // Replace with your actual API key const amount = 100; // Amount to convert const fromCurrency = "USD"; const toCurrency = "EUR"; convertCurrency(amount, fromCurrency, toCurrency, apiKey) .then(result => { if (result !== null) { console.log(`${amount} ${fromCurrency} is equal to ${result} ${toCurrency}`); } else { console.log("Currency conversion failed."); } }); ```
解説ïŒ
- `convertCurrency(amount, fromCurrency, toCurrency, apiKey)` 颿°ïŒ
- æç®ããéé¡ãå ã®é貚ã察象ã®é貚ãAPIããŒãå ¥åãšããŠåãåããŸãã
- ãã³ãã¬ãŒããªãã©ã«ã䜿çšããŠAPIã®URLãæ§ç¯ããŸãã`https://api.example.com/convert` ã䜿çšããŠããAPIã®æ£ãããšã³ããã€ã³ãã«çœ®ãæããããšãå¿ããªãã§ãã ããã
- `fetch`ã䜿çšããŠAPIã«éåæã®HTTPãªã¯ãšã¹ããéä¿¡ããŸãã
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- ãšã©ãŒãã³ããªã³ã°ïŒ
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- å®éã®ã¢ããªã±ãŒã·ã§ã³ã§ã¯ããŠãŒã¶ãŒã«æçãªã¡ãã»ãŒãžãæäŸããã¢ããªã±ãŒã·ã§ã³ã®ã¯ã©ãã·ã¥ãé²ãããã«ãããå ç¢ãªãšã©ãŒãã³ããªã³ã°ãå®è£ ããå¿ èŠããããŸãã
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- `YOUR_API_KEY` ãå®éã®APIããŒã«çœ®ãæããå¿ èŠããããŸãã
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- API URLïŒ
- ãã®ã³ãŒãã¯ãå¿ èŠãªãã©ã¡ãŒã¿ïŒäŸïŒ`from`, `to`, `amount`, `apiKey`ïŒã远å ããŠAPI URLãæ§ç¯ããŸãã
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- éåææäœïŒ
- ãã®ã³ãŒã㯠`async` ãš `await` ã䜿çšã㊠`fetch` APIã®éåææ§ãåŠçããŸãã
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JSONã¬ã¹ãã³ã¹äŸ
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```json { "from": "USD", "to": "EUR", "amount": 100, "result": 92.50 } ```
ãã®äŸã§ã¯ã`data.result` 㯠`92.50` ã«ãªããŸãã
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