whey append methods to the Object prototype instead of put them on constructor function ?

Question

Here is my problem, i have one object Car & theirs properties, i defined a method inside the object. but i think it is recommended to append this method to the object protytype, but why? what are the advantages and disadvantages? Thank you :)

What i did..

function Car (desc) {
    this.desc = desc;
    this.color = "red";
    this.getInfo = function getInfo() {
        return 'A ' + this.color + ' ' + this.desc + '.';
    };
}

Recommended :

Car.prototype.getInfo = function() {
    return 'A ' + this.color + ' ' + this.desc + '.';
};

@bfavaretto No, I think this is more of what he's looking for: http://stackoverflow.com/questions/9772307/declaring-javascript-object-method-in-constructor-function-vs-in-prototype — Sethen, Apr 01 '13 at 18:54

score 0 · Accepted Answer · answered Apr 01 '13 at 18:50

0

what you did results in every instance of Car having it's own copy of the getInfo method. Putting it on the prototype gives a that one function definition to every instance automatically.

answered Apr 01 '13 at 18:50

csturtz

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whey append methods to the Object prototype instead of put them on constructor function ?

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