JavaScript マスターズクラス2

• •特別な前提条件なし、インポートしてすぐに使用可能

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        "content": "# 🧱 Data Deduplication Tutorial\n\n**Author:** David Olusola\n\n## 🚀 n8n Coaching\nUnlock the full potential of n8n with personalized, one-on-one coaching. Whether you're just getting started or need help solving a specific challenge, I'll guide you step-by-step so you can build confidently and efficiently.\n\n👉 [Book Coaching Session](mailto:david@daexai.com?subject=n8n%20Coaching%20Request)\n\n## 🔧 n8n Consulting\nHave a complex automation project, unique integration needs, or want a custom workflow built from scratch? Let's collaborate to design and implement a robust solution tailored to your business.\n\n📩 [Inquire About Consulting Services](mailto:david@daexai.com?subject=n8n%20Consultation%20Request)"
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        "content": "## 📊 Sample Data\n\nThis node creates sample user data with intentional duplicates based on email addresses.\n\n**What it does:**\n- Creates an array of users\n- Includes duplicate entries (same email)\n- Simulates real-world messy data\n\n**Next Step:** Pass this data to the deduplication code node"
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        "content": "## 🧹 Deduplication Logic\n\n**Key Concepts:**\n- `filter()` - Creates new array with filtered elements\n- `findIndex()` - Returns index of first matching element\n- `index === self.findIndex()` - Keeps only first occurrence\n\n**Algorithm:**\n1. Parse JSON data\n2. Filter array keeping first occurrence of each email\n3. Transform back to n8n format\n4. Return deduplicated results"
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        "content": "## 📈 Results\n\n**What you'll see:**\n- Original count: 6 items\n- Deduplicated count: 4 items\n- Duplicates removed: 2 items\n\n**Use Cases:**\n- Clean data before CRM import\n- Prevent duplicate database entries\n- Data quality improvement\n- ETL pipeline cleanup"
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        "jsCode": "// Create sample data with intentional duplicates\nconst usersWithDuplicates = [\n  { id: 1, name: \"John Doe\", email: \"john@example.com\", department: \"Engineering\" },\n  { id: 2, name: \"Jane Smith\", email: \"jane@example.com\", department: \"Marketing\" },\n  { id: 3, name: \"John Doe\", email: \"john@example.com\", department: \"Engineering\" }, // Duplicate\n  { id: 4, name: \"Bob Johnson\", email: \"bob@example.com\", department: \"Sales\" },\n  { id: 5, name: \"Alice Brown\", email: \"alice@example.com\", department: \"HR\" },\n  { id: 6, name: \"Jane Smith Updated\", email: \"jane@example.com\", department: \"Marketing\" } // Duplicate\n];\n\n// Return the sample data as a single item with usersJson property\nreturn [{\n  json: {\n    usersJson: JSON.stringify(usersWithDuplicates),\n    totalCount: usersWithDuplicates.length,\n    message: \"Sample data with duplicates created\"\n  }\n}];"
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        "jsCode": "// 🧱 Data Deduplication Code Node\n// Use Case: Clean up duplicates before inserting into DB or CRM\n\n// Parse the users JSON from the previous node\nconst users = JSON.parse(items[0].json.usersJson);\n\n// Deduplicate users based on email address\n// This keeps the first occurrence of each unique email\nconst uniqueUsers = users.filter(\n  (user, index, self) => \n    index === self.findIndex(u => u.email === user.email)\n);\n\n// Log the deduplication results\nconsole.log(`Original count: ${users.length}`);\nconsole.log(`Deduplicated count: ${uniqueUsers.length}`);\nconsole.log(`Duplicates removed: ${users.length - uniqueUsers.length}`);\n\n// Return the deduplicated users in n8n format\n// Each user becomes a separate item in the workflow\nreturn uniqueUsers.map(user => ({ json: user }));"
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        "jsCode": "// Display the final results with statistics\nconst currentItems = items;\nconst uniqueCount = currentItems.length;\n\n// Create a summary of the deduplication process\nconst summary = {\n  deduplicated_users: currentItems.map(item => item.json),\n  statistics: {\n    unique_users_count: uniqueCount,\n    process_completed: true,\n    timestamp: new Date().toISOString()\n  },\n  message: `Successfully deduplicated data - ${uniqueCount} unique users remaining`\n};\n\nreturn [{ json: summary }];"
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        "content": "## 🎯 Learning Objectives\n\n**After this tutorial you'll understand:**\n\n✅ How to use JavaScript array methods in n8n\n✅ Data deduplication techniques\n✅ Working with JSON data in Code nodes\n✅ Transforming data between n8n items\n✅ Practical use cases for data cleaning\n\n**Best Practices:**\n- Always validate input data\n- Consider performance for large datasets\n- Test with various duplicate scenarios\n- Add error handling for production use"
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