Lisp Part Two

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History

Lisp Machines with Emacs

Clojure

Is a dialect of Lisp
lisp-journey.gitlab.io

Hirachical Structures

JavaScript vs. Lisp

[ "copy",
  {
    "todir" : "../new/dir"
    "fileset" : [
      { "dir" : "src_dir" }
    ]
  }
]

(copy
  (todir "../new/dir")
  (fileset (dir "src_dir")))i

Functions

cadr car cdr
’ everything after not evaluated

specialities of Common Lisp

Symbols can have multiple bindings

(set '= 42)
(symbol-function '=)
(symbol-value '=)
(symbol-plist '=)

(= = =)

Macros

evaluation of arguments is not always desired

(and 1 2 nil 3)				;;Arguments are evaluated from left to right, stops at nil
(if nil 1 2)				;;only one branch is evaluated
(defun f (n) (* 2 n))		;;interpreted as definition of a function