- Description about the talk
- When we want to find and replace code, we usually search by plain text or regular expression, it's quick for simple cases, but I'd like to share with you how to do a much more powerful and accurate find and replace based on AST.
I have built [synvert](https://synvert.net/) for years, it allows you to write snippet code to rewrite ruby code, it provides CLI, GUI, and VSCode extension, and it can automatically generate snippets, so even junior developers can rewrite code based on AST at will.
You'll learn how to query and mutate code based on AST node. You'll also learn how to use synvert GUI to rewrite your code even if you don't have any idea about AST.