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Can you link the textbook? I'd be interested in reading it.

I talk about dynamic arrays in Crafting Interpreters:

i really dig the art style of your diagrams! playful and clear

Thank you for giving away your book for free. I signed up for the mailing list and hope to purchase a copy when you're releasing printed versions.

You're welcome! I'm getting really close to having the print and ebook editions ready for sale.