• something that takes your code, and converts it into a syntax tree
    • it has nodes that describe what’s happening in your program
    • each node has a type and some other arbitrary data
    • almost everything uses ASTs under the hood
    • review the “Visitor pattern”
    • syntax trees are complex, is very important to know your node types well in order to work with them.
    • “Making easy things easy, and hard things possible” — fron the book “Learning Perl”
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