1962 the ideas of macros were introduced and macros are source code transformers, which take source code and generate new source code. This can also used in a compiled implementation, where macros translate the code before compiling.
FEXPRs are then functions which get arguments unevaluated and can decide at runtime which to evaluate and how.
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This 5 minute video by Wickham was eye opening for me regarding the lispiness or R.
https://youtu.be/nERXS3ssntw
modern Lisps don't use unquote/quote like that.
This looks more like 'FEXPRS' from decades ago.
1962 the ideas of macros were introduced and macros are source code transformers, which take source code and generate new source code. This can also used in a compiled implementation, where macros translate the code before compiling.
FEXPRs are then functions which get arguments unevaluated and can decide at runtime which to evaluate and how.