JAVASCRIPT PROTOTYPE CODE

An objects prototype object may also have a prototype object, which it inherits methods and properties from, and so on. What should you do instead?Д¬reate a function in a library file and import it when you want to use it. JavaScript is often described as a prototype-based language to provide inheritance, objects can have a prototype object, which acts as a template object that it inherits methods and properties from. This approach only creates technical debt and pretty much invites problems. Or maybe you did this in a library thatвЂ™s used by other people in their own projects. Perhaps for a client you donвЂ™t work for anymore.

(The class keyword is introduced in ES2015, but is syntactical sugar, JavaScript remains prototype-based.) JavaScript has always had a reserved word called class in its language, which means you cannot create your own variable by that name.

JAVASCRIPT PROTOTYPE CODE

Now what happens? You need to go back and rewrite all the code you wrote. JavaScript is dynamic and does not provide a class implementation. The Object.prototype is on the top of the prototype chain. Objects created with new Date() inherit the Date.prototype. Objects created using an object literal, or with new Object(), inherit from a prototype called Object.prototype. Suppose the next version of JavaScript implements the Array.insert method. All JavaScript objects inherit the properties and methods from their prototype. So, use prototype property of a function in the above example in order to have age properties across all the objects as shown below. You have a big problem here, because you canвЂ™t modify those libraries but you still want to use them. The prototype object is special type of enumerable object to which additional properties can be attached to it which will be shared across all the instances of its constructor function. Perhaps the methods work slightly differently, and things seem to work fine until they donвЂ™t. And another library you import does the same. Suppose a library you use implements such thing. Because other programming languages use classes, the class syntax in JavaScript makes it more straightforward for developers to move between languages. WhatвЂ™s wrong with this approach? Possible conflicts Classes in JavaScript do not actually offer additional functionality, and are often described as providing syntactical sugar over prototypes and inheritance in that they offer a cleaner and more elegant syntax. Instead of having to define such function and worry about the scope of it, you attach it to the Array object, so that every array has it available.Д«ut just because you can, it does not mean you should.

Javascript prototype