{"size": 114, "ext": "scrbl", "max_stars_repo_path": "tutorial/entry/side-effect.scrbl", "max_stars_repo_name": "SmallFont00/racket-tw.github.io", "max_stars_repo_stars_event_min_datetime": "2020-06-21T15:07:58.000Z", "max_stars_repo_stars_event_max_datetime": "2020-06-21T15:07:58.000Z", "max_issues_repo_path": "tutorial/entry/side-effect.scrbl", "max_issues_repo_name": "SmallFont00/racket-tw.github.io", "max_issues_repo_issues_event_min_datetime": "2020-06-24T03:17:49.000Z", "max_issues_repo_issues_event_max_datetime": "2022-02-08T06:00:08.000Z", "max_forks_repo_path": "tutorial/entry/side-effect.scrbl", "max_forks_repo_name": "SmallFont00/racket-tw.github.io", "max_forks_repo_forks_event_min_datetime": "2021-05-21T12:17:27.000Z", "max_forks_repo_forks_event_max_datetime": "2021-08-22T08:03:44.000Z"}
{"max_stars_count": 1, "max_issues_count": 9, "max_forks_count": 2, "avg_line_length": 7.125, "max_line_length": 21, "alphanum_fraction": 0.5964912281}
#lang scribble/manual

@title{副作用}

TODO

@codeblock{
(define a 1)

(define (foo x)
  (set! x 2)
  x)

(foo a)
a
}