Javascript: The good parts for humans (part 6)
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This document discusses different inheritance patterns in JavaScript: pseudoclassical, prototypal, and functional. Pseudoclassical inheritance uses constructor functions and the prototype property. Prototypal inheritance involves objects inheriting directly from other objects. Functional inheritance creates a new object using various methods, augments it with private variables and methods, and returns the object. Sample code is provided for each pattern to illustrate inheritance in JavaScript.
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Kindly look at it and give your comments to improve it as good as possible ways.
Javascript talk
Javascript topics covered in the document include prototypes, functions, scope, and "this". Prototypes act like blueprints for objects to inherit properties from. Functions are objects that have a prototype property pointing to their prototype object. Scope is determined by execution contexts and activation objects. The "this" keyword refers to different objects depending on how a function is invoked, such as the containing object for method calls or the global object for regular function calls.
2012 oct-12 - java script inheritance
This document discusses JavaScript inheritance using prototypes. It explains that objects inherit from other objects through their internal __proto__ property. Constructors set an object's __proto__ to reference the constructor's prototype. Methods can be added to the prototype and all objects will inherit those methods. The document also covers how to implement inheritance between constructors like Employee inheriting from Person without calling the parent constructor.
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This document discusses different patterns for invoking functions and setting the value of 'this' in JavaScript. It covers: the method invocation pattern where 'this' refers to the object containing the method; the function invocation pattern where 'this' defaults to the global object; the constructor invocation pattern where 'this' refers to a new object created; and the apply invocation pattern where 'this' is explicitly set as the first parameter of the apply method.
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- 1. JavaScript The good parts for humans (part 6) B Anjaneyulu Reddy Email: anji.t6@gmail.com Twitter: @_anji www.evibe.in
- 5. Prototypal Objects inherits from objects Differential inheritance Sample 2
- 6. Functional (1 of 2) Create a function which has 4 steps o It creates new object - Object literal - Constructor function with new keyword - Object.create() - call a function which returns an object o It has private (local) instance variables and methods o It augments that new object o return that new object
- 7. Functional (2 of 2) // pseudocode var constructor = function(spec) { var that, other private instance variables; that = a new object Add privileged methods to that return that; } Sample 3
- 8. Questions?
- 9. Thank You