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ScratchJr is a derivative of the Scratch language, which has been used by over 10 million people worldwide. Programming in Scratch requires basic reading skills, however, so the creators saw a need for another language which would provide a simplified way to learn programming at a younger age and without any reading or mathematics required.
Scratch is a high-level, block-based visual programming language and website aimed primarily at children as an educational tool, with a target audience of ages 8 to 16. [9] [10] Users on the site can create projects on the website using a block-like interface.
Like natural languages, programming languages follow rules for syntax and semantics. There are thousands of programming languages [1] and new ones are created every year. Few languages ever become sufficiently popular that they are used by more than a few people, but professional programmers may use dozens of languages in a career.
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).
The phrase grammar of most programming languages can be specified using a Type-2 grammar, i.e., they are context-free grammars, [8] though the overall syntax is context-sensitive (due to variable declarations and nested scopes), hence Type-1. However, there are exceptions, and for some languages the phrase grammar is Type-0 (Turing-complete).
The first player whispers the chosen phrase to the person next to them. It continues down the line or around the circle, until the last person receives the message. At that point, the last player ...
Scratch, a small amount of extra money; Old Scratch or Mr Scratch, a figure representing the devil; Scratch building, creation, from raw materials, of architectural scale models; Scratchcard (or scratch card, or scratcher), a small card with one or more areas containing concealed information which can be revealed by scratching off an opaque ...
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