Snap! – drag-and-drop programming language

Snap! (formerly BYOB) is a visual, block, drag-and-drop programming language. Unlike most programming languages, though, Snap! is a visual language; instead of writing a program using the keyboard, the Snap! programmer uses the same drag-and-drop interface familiar to computer users.

It is inspired by Scratch (a project of the Lifelong Kindergarten Group at the MIT Media Lab) that allows you to Build Your Own Blocks. It extends Scratch with first class procedures, first class lists, and other capabilities designed to support the teaching and learning of computer science. It targets both novice and more advanced students by including and expanding Scratch’s features. Snap! also features first class lists, first class procedures, and continuations.

A Snap! program consists of one or more scripts, each of which is made of blocks. It runs in your browser, and is implemented using JavaScript.

Features (extending Scratch):

  • First class functions or procedures (their mathematical foundations are called also “Lambda calculus”).
  • First class lists (including lists of lists).
  • First class sprites.
  • Nestable sprites.
  • Codification of Snap! programs to mainstream languages such as Python, JavaScript, C, etc.

Support: FAQ
Developer: University of California at Berkeley
License: AGPL


Snap! is written in JavaScript. Learn JavaScript with our recommended free books and free tutorials.

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