JavaScript Patterns 6.4 Prototypal Inheritance
No classes involved; Objects inherit from other objects.
Use an empty temporary constructor function F(). Set the prototype of F() to be the parent object. Return a new instance of the temporary constructor.
function Object(o) { function F() {} F.prototype = o; return new F(); } // object to inherit from var parent = { name: "Papa" }; // the new object var child = Object(parent); // testing alert(child.name); // "Papa"
Addition to ECMAScript 5
In ECMAScript 5, the prototypal inheritance pattern becomes officially a part of the language. This pattern is implemented through the method Object.create().
var child = Object.create(parent);
Object.create()accepts an additional parameter, an object. The properties of the extra object will be added as own properties of the new child object being returned.
var child = Object.create(parent, { age: { value: 2 } // ECMA5 descriptor }); child.hasOwnProperty("age"); // true
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