.forEach(), .map(), .filter() .... What's the difference?
.forEach(), .map(), .filter() .... What's the difference?
May 11, 2018
dev.to
forEach() vs. map() - What’s the Difference?
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forEach() vs. map() - What’s the Difference?
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teamtreehouse.com
🎯 JavaScript: map() vs forEach() — Know the Difference Understanding the difference between map() and forEach() is essential for writing clean, predictable, and maintainable JavaScript code. 🔹 map() ✅ Returns a new array 🔁 Used for data transformation 🧼 Keeps code functional & immutable 🔹 forEach() ❌ Returns undefined ⚙️ Used for side effects (logging, updating variables) 🛠 Best for executing actions, not transformations 👉 Rule of thumb: If you need a new array → use map() If you just nee
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