NetLogo - Programming language

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NetLogo is an open source programming language created in 1999 by Uri Wilensky.

#190on PLDB

25Years Old

4kRepos

Download source code:

git clone https://github.com/NetLogo/NetLogo

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NetLogo is an agent-based programming language and integrated modeling environment.. Read more on Wikipedia...

Tags: programming language, simulation
NetLogo is developed on GitHub and has 1,001 stars
There are at least 3,859 NetLogo repos on GitHub
Early development of NetLogo happened in Northwestern University
NetLogo is written in Scala, Java, CSV, mustache, XML, Bourne shell, Markdown, YAML, HTML, XSLT, CSS, Bash, DTD
The Google BigQuery Public Dataset GitHub snapshot shows 138 users using NetLogo in 154 repos on GitHub
Explore NetLogo snippets on Rosetta Code
NetLogo on HOPL
GitHub supports syntax highlighting for NetLogo
See also: (5 related languages) StarLogo, Logo, ISBN, Scala, Java
1 PLDB concepts link to NetLogo: xTAO Modeling Language

Example from Linguist:

patches-own [
  living?         ;; indicates if the cell is living
  live-neighbors  ;; counts how many neighboring cells are alive
]

to setup-blank
  clear-all
  ask patches [ cell-death ]
  reset-ticks
end

to setup-random
  clear-all
  ask patches
    [ ifelse random-float 100.0 < initial-density
      [ cell-birth ]
      [ cell-death ] ]
  reset-ticks
end

to cell-birth
  set living? true
  set pcolor fgcolor
end

to cell-death
  set living? false
  set pcolor bgcolor
end

to go
  ask patches
    [ set live-neighbors count neighbors with [living?] ]
  ;; Starting a new "ask patches" here ensures that all the patches
  ;; finish executing the first ask before any of them start executing
  ;; the second ask.  This keeps all the patches in synch with each other,
  ;; so the births and deaths at each generation all happen in lockstep.
  ask patches
    [ ifelse live-neighbors = 3
      [ cell-birth ]
      [ if live-neighbors != 2
        [ cell-death ] ] ]
  tick
end

to draw-cells
  let erasing? [living?] of patch mouse-xcor mouse-ycor
  while [mouse-down?]
    [ ask patch mouse-xcor mouse-ycor
      [ ifelse erasing?
        [ cell-death ]
        [ cell-birth ] ]
      display ]
end

Language features

Feature	Supported	Example	Token
Booleans	✓		true false
Comments	✓	; A comment
Line Comments	✓	; A comment	;
Semantic Indentation	X