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{{DISPLAYTITLE:Snap''!'' (programming language)}}
{{Infobox programming language
| name = Snap''!''
| logo = [[File:Snap!.svg|200px]]
| logo size = 90PX
| paradigm = [[Object-oriented programming|object-oriented]], [[educational programming language|educational]], [[Event-driven programming|event-driven]]
| year = {{start date and age|2011}}
| designer = [[Brian Harvey (lecturer)|Brian Harvey]] and [https://github.com/jmoenig/ Jens Mönig]
| developer = [https://github.com/jmoenig/ Jens Mönig]
| latest release version =
| latest release date = {{Start date and age|
| typing = [[Type system|dynamic]]
| implementations =
| programming language = Morphic.js<ref name="morphic_js">{{cite web |last1=Mönig |first1=Jens |title=morphic.js |url=https://github.com/jmoenig/morphic.js/blob/master/morphic.txt |website=GitHub |accessdate=7 June 2023}}</ref> (written in [[JavaScript]]); {{#tag:ref|BYOB was written in [[Squeak]].|group=Note}}
| dialects =
| influenced by = [[Scratch (programming language)|Scratch]], [[Scheme (programming language)|Scheme]], [[Logo (programming language)|Logo]], [[Smalltalk]], [[APL (programming language) | APL]]
| influenced = [[Scratch (programming language)|Scratch]], BeetleBlocks, NetsBlox, Dragme IDE, [[Turtlestitch]]
| operating system = [[Cross-platform]]
| license = [[Affero General Public License|AGPL]]
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}}
'''Snap''!''''' (formerly Build Your Own Blocks) is a free block-based [[List of educational programming languages|educational]] graphical programming language and online community. Snap
==User interface==
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| bgcolor="#BB42C3"| || Sound || Plays audio files and <br />programmable sequenced audio || bgcolor="#5CB712"| || Operators || Mathematical, text, and<br />Boolean operators; lambda
|- valign="top"
| bgcolor="#0E9A6C"| || Pen || Write, draw, or<br />stamp on stage || bgcolor="#C88330"| || Variables || Variables, lists,<br />including lists of lists, lists of blocks, etc
|}
[[File:Snap! Default interface.png|thumb|left|420px|''Three resizable columns, containing five regions, in Snap!'s [[Integrated development environment|IDE]] at startup'']]
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The central area can show scripts, costumes/backdrops, or sounds associated with the selected sprite. What that area shows depends on the selected tab.
{{clear}}
==Features==
The most important features that Snap''!'' offers, but Scratch does not, include:
* Expressions using anonymous functions, represented by a block inside a gray ring, having one or more empty slot(s)/argument(s) that are filled by a "higher order function" (the one that is calling the anonymous one). (Their computer-science theoretical basis is [[first class function]]s, which in turn have [[lambda calculus]] as their even more abstract and mathematical foundation)
* Lists that are [[First class object|first class]] (including ''lists of lists/arrays'')
* ''First class'' sprites (or in other words, [[
* "Hyperblocks": functions whose natural ___domain is scalars (text or numbers), extended to accept lists as inputs and apply the underlying function to the scalars in the list or a sublist
* Nestable sprites
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==Mascot==
[[File:Snap! mascot, Alonzo.svg|50px|right]]
Alonzo, the mascot of Snap''!'', bears the name of [[Alonzo Church]], the inventor of a model of computation in which a universal function, represented by lambda, can create any function behavior by calling it on itself in various combinations. The mascot is a modified version of Gobo from [[Scratch (programming language)|Scratch]], with permission of the Scratch Team. Because Alonzo Church's work is called [[lambda calculus]], the mascot's hair is shaped as the Greek letter [[lambda]].
==Special-purpose blocks (libraries)==
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Many other libraries are available, such as the 'list utilities' library, the 'words, sentences' library, the 'iterations' library, the 'animation' library, the 'frequency distribution' library, the 'audio computation' library, the 'bar charts' library, the 'world map' library, the 'colors and crayons' library, the 'strings and multi-line input' library, the 'parallelization' library, etc. for other special purposes.
== Limitations ==
While the software itself has little restraints, it does have some limitations.
These include:
* No native cloud variables
* 10 [[megabyte]] file cap for uploading (Snap''!'' Cloud only)
* Users have to manually enable Javascript when loading a project that uses inline bits of JS, due to a hack a few years ago.
==History==
The web-based Snap''!'' and older desktop-based
==License==
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==Platforms==
Supported web-browsers such as
* Firefox
* Chrome (and most Chromium based browsers.)
* Opera GX
* Microsoft Edge
* Safari
==Implementation==
All things visible in Snap''!'' are morphs themselves, i.e. all buttons, sliders, dialog boxes, menus, entry fields, text rendering, blinking cursors etc. are created with morphic.js rather than using HTML DOM elements. Snap! caches the shapes of [[Sprite (computer graphics)|sprite]]s so the sprite doesn't have to be re-drawn onto a new Canvas element every time the mouse moves over its bounding box. It does not cache blocks, however. Instead it manages the insides of C-shaped blocks through the morphic "holes" mechanism.
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==Recognition==
Snap''!'' has been recognized by the Logo Foundation,<ref>{{cite web|url=http://el.media.mit.edu/logo-foundation/what_is_logo/history.html|title=Logo History|website=el.media.mit.edu|access-date=21 May 2017}}</ref> and reviewed in an online magazine for programmers.<ref>{{cite web|url=http://www.i-programmer.info/news/98-languages/8628-visual-language-snap-version-40-released.html|title=Visual Language Snap! Version 4.0 Released|first = Sue|last=
==Notes==
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==External links==
* {{Official website|snap.berkeley.edu}}
{{Video game engines |state=collapsed}}
{{DEFAULTSORT:Snap! (Programming Language)}}
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