CODEWITHSUNDEEP
javascriptobject
Jitender
Jitender

Reputation: 7969

using prototype in custom object in javascript

I have made my custom object and I want to add a method into. I want to uppercase my values. But it is giving me [object object].Any idea how to get it done. fiddle

function checkObj (name,title,salary){
    this.name= name;
    this.title= title;
    this.salary= salary;
    }

var woo=new checkObj("rajora","this is a test",2000);
checkObj.prototype.inc=function (){
    for(i=0;i<this.length;i++){
    this[i]= this[i].toUpperCase();
    }
    };
woo.inc();
console.log(woo)

Upvotes: 0

Views: 59

Answers (3)

Hawk
Hawk

Reputation: 88

Demo here.

js code like this :

function checkObj (name,title,salary){
this.name= name;
this.title= title;
this.salary= salary;
}

checkObj.prototype.inc=function(){

var self=this;

for(var i in self){
    if(self.hasOwnProperty(i)){
        output(i);
    }
}

function output(item){
    if(typeof self[item]==='string'){
        self[item]=self[item].toUpperCase();
        console.log(self[item]);
    }
}
};

Is helpful for you ?

Upvotes: 1

thefourtheye
thefourtheye

Reputation: 239573

You just have to change your inc function like this

checkObj.prototype.inc = function() {
    for (var key in this) {
        if (this.hasOwnProperty(key)) {
            if (typeof this[key] === 'string') {
                this[key] = this[key].toUpperCase();
            }
        }
    }
};

and this gives me the following output

{ name: 'RAJORA', title: 'THIS IS A TEST', salary: 2000 }

Upvotes: 1

Ibrahim Najjar
Ibrahim Najjar

Reputation: 19423

When you call console.log() and pass it an object like woo, it uses woo.toString() to get the string representation of it and print it.

woo inherits toString() from Object.prototype which by default prints the string you are getting, i.e. [object object].

You have to override toString() like this:

checkObj.prototype.toString = function() {
    var result = "checkObj {";
    for (var prop in this) {
        if (this.hasOwnProperty(prop))
            result += (prop + " : " + String(this[prop]).toUpperCase() + ", ");
    }
    result += ("}");
    return result;
}

Now you can just console.log(woo) and it would work as expected.

Upvotes: 1

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