Javascript foundations: Inheritance
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This presentation forms part of a tutorial on learning Javascript foundations. It introduces the concept of classes and inheritance in object oriented programming. Classical and prototypal inheritance in Javascript are discussed and the Object.beget method is introduced.
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The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
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Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
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Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
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- These are slides of the talk given at IEEE International Conference on Software Testing Verification and Validation Workshop, ICSTW 2022.
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Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
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- 1. inheritance Learning Javascript foundations John Hunter 12 November 2008
- 2. are these the same thing?
- 3. 1 2 radio toggleButton we have one radio with two buttons
- 4. toggleButton toggleUp () toggleDown () toggleButtons share the same behaviour (methods) we could say they are a particular class of objects
- 5. Class Defines the abstract characteristics of a thing (object), including the thing's characteristics (its attributes, fields or properties) and the thing's behaviours (the things it can do, or methods, operations or features). One might say that a class is a blueprint or factory that describes the nature of something. For example, the class Dog would consist of traits shared by all dogs, such as breed and fur colour (characteristics), and the ability to bark and sit (behaviours). source: wikipedia/Object_orientated_programming
- 6. Javascript does not have formal classes it can approximate class based programming but it has other mechanisms for inheritance
- 7. class-based inheritance vs. prototype-based inheritance nothing to do with the Prototype framework
- 8. Classical inheritance ToggleButton instantiate tuningButton volumeButton function ToggleButton () { … } var tuningButton = new ToggleButton(); var volumeButton = new ToggleButton();
- 9. Prototypal inheritance toggleButton prototype tuningButton volumeButton beget var toggleButton = { … }; var tuningButton = Object.beget(toggleButton); var volumeButton = Object.beget(toggleButton);
- 10. toggleButton toggleUp () toggleDown () prototype Then look here tuningButton First look here tuningButton.toggleUp();
- 11. class-based approach: you always have to create a class blueprint in order to create an object prototype-based approach: you can use an existing object as a prototype for more objects
- 12. Object.beget = function (obj) { var F = function () {}; F.prototype = obj; return new F(); }; // myThing = Object.beget(thing); the beget method returns an object that uses the argument as its prototype source: Doug Crockford
- 13. There is more to inheritance ...but that’s all for now!
- 14. Review classes of objects share characteristics and behaviour Javascript supports several inheritance mechanisms Class-based (but not true classes) Prototype-based
- 15. Thanks