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  2. G2A - Wikipedia

    en.wikipedia.org/wiki/G2A

    Users. 30 million (as of 2024) G2A.COM Limited (commonly referred to as G2A) is a digital marketplace headquartered in the Netherlands, [ 1][ 2] with offices in Poland and Hong Kong. [ 3][ 4] The site operates in the resale of gaming offers and others digital items by the use of redemption keys. G2A.COM’s main offerings are game key codes for ...

  3. Universally unique identifier - Wikipedia

    en.wikipedia.org/wiki/Universally_unique_identifier

    The random nature of standard UUIDs of versions 3, 4, and 5, and the ordering of the fields within standard versions 1 and 2 may create problems with database locality or performance when UUIDs are used as primary keys. For example, in 2002 Jimmy Nilsson reported a significant improvement in performance with Microsoft SQL Server when the ...

  4. 2–3–4 tree - Wikipedia

    en.wikipedia.org/wiki/2–3–4_tree

    Space. O (n) O (n) In computer science, a 2–3–4 tree (also called a 24 tree) is a self-balancing data structure that can be used to implement dictionaries. The numbers mean a tree where every node with children ( internal node) has either two, three, or four child nodes: a 2-node has one data element, and if internal has two child nodes;

  5. Java virtual machine - Wikipedia

    en.wikipedia.org/wiki/Java_virtual_machine

    A Java virtual machine ( JVM) is a virtual machine that enables a computer to run Java programs as well as programs written in other languages that are also compiled to Java bytecode. The JVM is detailed by a specification that formally describes what is required in a JVM implementation. Having a specification ensures interoperability of Java ...

  6. Java (software platform) - Wikipedia

    en.wikipedia.org/wiki/Java_(software_platform)

    Java is a set of computer software and specifications that provides a software platform for developing application software and deploying it in a cross-platform computing environment. Java is used in a wide variety of computing platforms from embedded devices and mobile phones to enterprise servers and supercomputers.

  7. Functional programming - Wikipedia

    en.wikipedia.org/wiki/Functional_programming

    The lambda calculus, developed in the 1930s by Alonzo Church, is a formal system of computation built from function application. In 1937 Alan Turing proved that the lambda calculus and Turing machines are equivalent models of computation, [ 37 ] showing that the lambda calculus is Turing complete. Lambda calculus forms the basis of all ...

  8. Java (programming language) - Wikipedia

    en.wikipedia.org/wiki/Java_(programming_language)

    Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers write once, run anywhere ( WORA ), [ 16] meaning that compiled Java code can run on all platforms that support Java without the ...

  9. API key - Wikipedia

    en.wikipedia.org/wiki/API_key

    API keys are generally not considered secure; they are typically accessible to clients, making it easy for someone to steal an API key. Once the key is stolen, it has no expiration, so it may be used indefinitely, unless the project ownerrevokes or regenerates the key.[2] Since API keys must only be accessible to the client and server ...