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2. String (computer science) - Wikipedia

   en.wikipedia.org/wiki/String_(computer_science)

   String (computer science) Strings are typically made up of characters, and are often used to store human-readable data, such as words or sentences. In computer programming, a string is traditionally a sequence of characters, either as a literal constant or as some kind of variable. The latter may allow its elements to be mutated and the length ...

3. Pumping lemma for context-free languages - Wikipedia

   en.wikipedia.org/wiki/Pumping_lemma_for_context...

   In computer science, in particular in formal language theory, the pumping lemma for context-free languages, also known as the Bar-Hillel lemma, [1] is a lemma that gives a property shared by all context-free languages and generalizes the pumping lemma for regular languages. The pumping lemma can be used to construct a refutation by ...

4. Context-free grammar - Wikipedia

   en.wikipedia.org/wiki/Context-free_grammar

   In formal language theory, a context-free grammar (CFG) is a formal grammar whose production rules can be applied to a nonterminal symbol regardless of its context. In particular, in a context-free grammar, each production rule is of the form. with a single nonterminal symbol, and a string of terminals and/or nonterminals ( can be empty).

5. No Strings (I'm Fancy Free) - Wikipedia

   en.wikipedia.org/wiki/No_Strings_(I'm_Fancy_Free)

   No Strings (I'm Fancy Free) " No Strings (I'm Fancy Free) " is a popular song written by Irving Berlin for the 1935 film Top Hat, where it was introduced by Fred Astaire. In the film, the character played by Astaire is advised to get married and Astaire responds by saying he prefers to remain as a bachelor and he launches into this song and a ...

6. Primitive data type - Wikipedia

   en.wikipedia.org/wiki/Primitive_data_type

   In JavaScript, there are 7 primitive data types: string, number, bigint, boolean, symbol, undefined, and null. [19] Their values are considered immutable. These are not objects and have no methods or properties; however, all primitives except undefined and null have object wrappers.

7. 52 Incredibly Cool Things That Are Free Online That Everyone ...

   www.aol.com/52-helpful-things-free-everyone...

   Image credits: agentp2319 #5. I built [qrfa.st](https://qrfa.st) which offers free qr codes. I built it because I heard horror stories about people making qr codes, only to find out later they had ...