Super keyword
The super construct accesses or invokes inherited methods, constructors, or attributes according to a language’s inheritance rules.
The Well-Grounded Rubyist, Fourth Edition
super is a Ruby keyword that invokes the next implementation of the current method in the method-lookup path, preserving the current call's arguments and block when no argument syntax is supplied.
- How it is used
- Uses `super` to wrap an existing method while retaining the next implementation’s behavior.
- How deep it goes
- Explains lookup-path traversal and argument forwarding, contrasting bare `super` with `super()`.
- Examples
- Uses a class-and-module `report`, a bicycle initializer, missing-method handlers, and an object-specific `String#gsub!` wrapper.
- What you can do after
- Evaluate/understand which method an override calls next and when its original arguments and block pass through.
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The Well-Grounded Python Developer: How the pros use Python and Flask
super is a Python mechanism that provides access to methods and other attributes defined in a class's parent according to the method resolution order.
- How it is used
- Delegates subclass initialization to parent constructors within shape hierarchies.
- How deep it goes
- Explains parent-constructor delegation through Square and Circle examples, without detailing broader method-resolution behavior.
- Examples
- Uses Square, Rectangle, Shape, and Circle classes with delegated dimensions and shape-specific drawing.
- What you can do after
- Apply it via Python to reuse parent initialization while customizing subclass-specific parameters and behavior.
Kotlin in Action, 2E
- How it is used
- Resolves inherited interface implementations and initializes superclass constructors from Kotlin subclasses.
- How deep it goes
- Explains qualified interface calls, constructor delegation paths, and Java syntax differences without descending into compiler-generated bytecode.
- Examples
- Uses Button with Clickable and Focusable, plus MyDownloader delegating to String and URI superclass constructors.
- What you can do after
- Apply it via Kotlin syntax to select inherited interface behavior and delegate subclass construction to superclass constructors.
Essential TypeScript 5, Third Edition
The super keyword accesses a class's superclass constructor, properties, or methods.
- How it is used
- Connects subclass constructors and methods to inherited implementation while extending JavaScript and TypeScript classes.
- How deep it goes
- Explains constructor ordering, inherited initialization, method reuse, and overriding, but does not detail prototype internals.
- Examples
- Uses Product and TaxedProduct classes plus Person and Employee classes to demonstrate initialization and inherited behavior.
- What you can do after
- Build subclass constructors and overridden methods that reuse superclass initialization and behavior.
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Get Programming with JavaScript Next: New features of ECMAScript 2015, 2016, and beyond
A JavaScript keyword used in a subclass to invoke superclass constructors or access superclass methods and properties.
- How it is used
- Uses super to initialize subclass instances and reuse superclass behavior.
- How deep it goes
- Explains constructor ordering, prototype method access, and why instance class properties are unavailable through super.
- Examples
- Shows TeamStore passing a URL to DataStore, ProductStore extending fetch, and binding an overridable method.
- What you can do after
- Apply super to initialize subclasses before using this and extend superclass methods without discarding their behavior.
Python How-To
- How it is used
- Extends overridden subclass behavior by calling a superclass method or constructor.
- How deep it goes
- Explains super() as a proxy and demonstrates method and constructor calls; limits its MRO discussion to single inheritance.
- Examples
- Uses a Supervisor logout override and a PokerOrder int subclass that maps face cards for sorting.
- What you can do after
- Apply super() to reuse a superclass implementation while customizing a subclass method or constructor.
Related concepts
- superclassuses · A superclass is a class from which another class inherits members, structure, state, or behavior.
- constructor methoduses · A constructor is a type-associated operation or callable that creates or initializes an instance and establishes its initial state.
- method_missingused by · method_missing is a Ruby method invoked as a last resort when an object receives a message for which no matching method is found.
- method resolution orderuses · Method resolution order is the ordered sequence in which a programming language searches a class and its ancestors for methods or attributes.
- method lookupuses · Method lookup is the process of determining which implementation executes for a method invocation based on the receiver and applicable definitions.
- proxyproduces · A proxy is an intermediary object or component that represents another object or system and mediates interactions with it.
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