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Blockly is a client-side JavaScript library for creating visual block programming languages and editors. It is a project of Google and is open-source under the Apache 2. It can also be customised to generate code in any textual computer language. Development of Blockly started in summer of , and the first public release was at Maker Faire in May Blockly was originally designed as a replacement for OpenBlocks in App Inventor.
The default user interface of the Blockly editor consists of a toolbox, which holds available blocks, and a workspace, where the user can drag from the toolbox and rearrange blocks. The workspace also includes, by default, zoom icons and a trashcan for deleting blocks. Blockly includes a set of visual blocks for common operations, but can be customized by adding more blocks.
New blocks require a block definition and a generator. The definition describes the block's appearance user interface and the generator describes the block's translation to executable code. Definitions and generators can be written in javascript, or using a visual set of blocks, the Block Factory, which allows new blocks to be described using existing visual blocks; the intention is to make creating new blocks easier.
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