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Abstract Syntax Trees (AST) #

• Code is parsed into its constituent tokens and placed in an AST, which is a tree structure that represents the semantics of the code
• Parser: Something that converts code into a syntax tree

Refactoring Code with ASTs #

• Modifying ASTs and generating the source from those ASTs allow you to programmatically refactor code
  • This is how eslint and prettier automatically fix code

JIT #

• The first time a set of instructions is encountered it is compiled into native machine code. This is then cached uponsubsquent invocations