|Paradigm||object-oriented, educational, event-driven|
|Designed by||Brian Harvey and Jens Mönig|
6.9.0 / June 14, 2021
|Filename extensions||.xml (Snap!)|
|Scratch, Scheme, Logo, Smalltalk|
|BeetleBlocks, Snapi, Dragme IDE, Turtlestitch|
Snap! (formerly Build Your Own Blocks or BYOB) is a free, block-based educational graphical programming language and online community aimed at students to explore, create and re-mix interactive animations, games, stories, and more, while learning about mathematical and computational ideas. While inspired by Scratch, Snap! has many advanced features. The Snap! editor, and programs created in it, are web applications that run in the browser (like Scratch 2 and 3) without requiring installation.[Note 2]
In Snap!, the screen is organized in three resizable columns containing five regions: the block group selector (top of left column), the blocks palette (left column), the main area (middle column), and the stage area (top of right column) with the sprite selector (also called the sprite corral) showing sprite thumbnails below it.[Note 3]
In the interactively resizable stage area (full-screen is available, too) are drawn the graphical results (i.e. animations, graphics, etc.) of the scripts running in the script area, and/or interactively double-clicked individual blocks in any palette. Individual blocks can be dragged from the palette onto the scripts area to be associated with the selected sprite.
|Motion||Moves sprites and
|Control||If statements, events,|
and loop structures
costumes, and output
|Sensing||All sprite hit detection|
and user input
|Sound||Plays audio files and
programmable sequenced audio
including lists of lists
Snap!'s blocks are divided into eight groups: Motion, Looks, Sound, Pen, Control, Sensing, Operators, and Variables. The layout of these groups in the block group selector is shown in the table below.
The central area can show scripts, costumes, or sounds associated with the selected sprite. What the main area shows depends on the selected tab.
The most important features that Snap! offers, but Scratch does not, include:
The web-based Snap! and older desktop-based BYOB have been both developed by Jens Mönig for Windows, OS X and Linux with design ideas and documentation provided by Brian Harvey from University of California, Berkeley and have been used to teach "The Beauty and Joy of Computing" introductory course in computer science (CS) for non-CS-major students. Jens was a member of the Scratch Team before creating Snap!. BYOB is still available for downloading.
The source code of Snap! is Affero General Public License (AGPL) licensed and is hosted on GitHub. The earlier, desktop-based 3.x version's code is available under a license that allows modification for only non-commercial uses and can be downloaded from the UC Berkeley website or CNET's Download.com and TechTracker download page.
Snap! has been recognized by the Logo Foundation, and reviewed in an online magazine for programmers. As of December 2014, 100 New York City (NYC) high schools will introduce University of California, Berkeley's “Beauty and Joy of Computing” as a new AP Computer Science Principles course starting in 2015, using Snap!.
Edited: 2021-06-18 18:19:20