CODEWITHSUNDEEP
javascriptinheritanceprototype
Siddharth
Siddharth

Reputation: 545

Multi Inheritance in JavaScript

Why this type of inheritance will not work in JavaScript. Is there any way to perform this step. Please help

function base() {}
base.prototype.findFirst = function() {
    console.log("FindMe First");
}

function base2() {}
base2.prototype.findMe = function() {
    console.log("FindMe ");
}

function inherit() {
    base.call(this);
    base2.call(this);
}

inherit.prototype = base.prototype;
inherit.prototype.constructor = inherit;
inherit.prototype = base2.prototype;
inherit.prototype.constructor = inherit;

var test = inherit();
test.findFirst();
test.findMe();

Upvotes: 0

Views: 133

Answers (3)

Biraj B Choudhury
Biraj B Choudhury

Reputation: 684

Mixins can be used in javascript to achieve the same goal you probably want to solve via multiple inheritance at the moment.

Upvotes: 1

DimoMohit
DimoMohit

Reputation: 755

You are overwritting prototype with base.prototype and then with base2.prototype. So it stores base2.prtotype i.e. which is assigned second. Now if you create an instance of your inherit class var test = new inherit(); you will see that test has base2.property i.e. it has fimeMe() method in test.property.findMe();. To achieve your goal you should try to extend or refer Mixin Multiple Inheritance

Upvotes: 2

bitWorking
bitWorking

Reputation: 12655

I've extended the Function prototype which is not the best idea, but to give you an idea of how it works. It's not multi inheritance, but it's an inheritance tree.

Function.prototype.extend = function(child)
{
    var childPrototype = child.prototype;
    child.prototype = Object.create(this.prototype);
    for (var property in childPrototype) {
        if (childPrototype.hasOwnProperty(property)) {
            child.prototype[property] = childPrototype[property];
        }
    }
    child.prototype.constructor = child;
    return child;
};

var base = (function()
{
    var base = function()
    {

    };

    base.prototype.findFirst  = function(x, y)
    {
        console.log("FindMe First");
    };

    return base;

}());

var base2 = base.extend(function()
{
    var base2 = function()
    {

    };

    base2.prototype.findMe = function(x, y)
    {
        console.log("FindMe ");
    };

    return base2;

}());

var inherit = base2.extend(function()
{
    var inherit = function()
    {

    };

    return inherit;

}());

var test = new inherit();
test.findFirst();
test.findMe();

Upvotes: 0

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