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deno eval

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The deno eval command is an essential tool for executing small snippets of code without the need for a separate file.

Overview​

The eval command is used to evaluate code snippets written in JavaScript or TypeScript. You can utilize this command to quickly test out code or run scripts in an interactive manner.

Syntax:

deno eval [OPTIONS] <SCRIPT>

Options​

  • --help: Show help information about the eval command.
  • --no-check: Skip type checking the script (useful for TypeScript).

Example Usage​

To evaluate a simple expression, run:

deno eval "console.log('Hello, Deno!');"

Key Takeaway​

“deno eval is perfect for quick testing and prototyping.”
— Deno Documentation

Advanced Features​

Click here for advanced usage tips

  1. Running Asynchronous Code:

    deno eval "const fetchData = async () => { const response = await fetch('https://example.com'); return response.json(); }; fetchData().then(console.log);"

  2. Using External Modules:

    deno eval "import { serve } from 'https://deno.land/std/http/server.ts'; serve(() => new Response('Hello World'));"

When using deno eval, remember to keep your code snippets concise for better readability and maintainability.

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Be cautious when executing untrusted code snippets as they could potentially harm your system or compromise security.

For further reading, refer to the Deno Documentation.