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  2. Python syntax and semantics - Wikipedia

    en.wikipedia.org/wiki/Python_syntax_and_semantics

    For example, one could define a dictionary having a string "toast" mapped to the integer 42 or vice versa. The keys in a dictionary must be of an immutable Python type, such as an integer or a string, because under the hood they are implemented via a hash function. This makes for much faster lookup times, but requires keys not change.

  3. Command-line argument parsing - Wikipedia

    en.wikipedia.org/wiki/Command-line_argument_parsing

    Command-line argument parsing is the process of analyzing and handling command-line input provided to a program.

  4. Async/await - Wikipedia

    en.wikipedia.org/wiki/Async/await

    The first expression to execute when this method is called will be new HttpClient().GetByteArrayAsync(uri), [13]: 189–190, 344 [1]: 882 which is another asynchronous method returning a Task<byte[]>. Because this method is asynchronous, it will not download the entire batch of data before returning.

  5. Entry point - Wikipedia

    en.wikipedia.org/wiki/Entry_point

    In most of today's popular programming languages and operating systems, a computer program usually only has a single entry point.. In C, C++, D, Zig, Rust and Kotlin programs this is a function named main; in Java it is a static method named main (although the class must be specified at the invocation time), and in C# it is a static method named Main.

  6. Callback (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Callback_(computer...

    As alert requires a string, form produces a string from the result of calculate; The get-word! values (i.e., :calc-product and :calc-sum) trigger the interpreter to return the code of the function rather than evaluate with the function. The datatype! references in a block! [float! integer!] restrict the type of values passed as arguments.

  7. Function (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Function_(computer...

    In computer programming, a function (also procedure, method, subroutine, routine, or subprogram) is a callable unit [1] of software logic that has a well-defined interface and behavior and can be invoked multiple times.

  8. Command pattern - Wikipedia

    en.wikipedia.org/wiki/Command_pattern

    A sample UML class and sequence diagram for the Command design pattern. [3]In the above UML class diagram, the Invoker class doesn't implement a request directly. Instead, Invoker refers to the Command interface to perform a request (command.execute()), which makes the Invoker independent of how the request is performed.

  9. Exception handling syntax - Wikipedia

    en.wikipedia.org/wiki/Exception_handling_syntax

    Try {Import-Module ActiveDirectory} Catch [Exception1] {# Statements that execute in the event of an exception, matching the exception} Catch [Exception2],[Exception3etc] {# Statements that execute in the event of an exception, matching any of the exceptions} Catch {# Statements that execute in the event of an exception, not handled more ...