javascript constructor function not giving correct result -

i newbie js. trying use constructor function create object. here code

    function player(name,age,rank) {      this.name=name;     this.age=age;     this.rank=rank;     this.sayeverything=function()     {          return "the name of player " + this.name + "the age " + this.age + "the rank " + this.rank;      } 

now adding new property this

player.matchready=true; 

now create object this

var kaka=new player("kaka",22,3,false); 

and when write this

document.write('kaka match ready-->' + kaka.matchready); 

it gives me output kaka match ready-->undefined

why giving me undefined?? haven't added new property correctly??please tell me. thanks.

instead of player.matchready=true;

do, player.prototype.matchready = true;

this way players have match ready default on true;

also might want put function prototype.

player.prototype.sayeverything=function()     {          return "the name of player " + this.name + "the age " + this.age + "the rank " + this.rank;      } 

you can regard prototype scaffolding on outline properties , functions object should have when it's instantiated. these default values same objects.

when add functions within functions these functions duplicated in memory when instantiate new object.

when possible , when there no need scoping, try add generic functions sayeverything()(please rename tostring() keep in line convention) prototype.

that way player objects can use same function. more memory efficient.