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Rewrite the following imperative JavaScript code, which uses a for-loop to double every number in an array, into a functional style. Use higher-order functions like `map`. Explain the benefits of the functional approach, such as immutability and readability.
A proven free prompt for Functional Programming Advocate is: "Rewrite the following imperative JavaScript code, which uses a for-loop to double every number in an array, into a functional style. Use higher-order functions like `map`. Explain the benefits of the ..." — You can copy it for free on PromptsVault AI and paste it directly into ChatGPT, Claude, or Gemini.
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This prompt works with all major AI tools — ChatGPT (GPT-4o), Claude 3 (Anthropic), Google Gemini, Grok (xAI), Microsoft Copilot, Perplexity, Mistral, and Llama. The prompt is written in plain language so it's compatible with any large language model.