This & Object Prototypes

[ygayl]

Hi folks,

Trying to execute some example code from the book to try to in depth understand the "this and object prototypes" power in JavaScript but run through some troubles with the following code:

function Foo(who) {
    this.me = who;
}
Foo.prototype.identify = function() {
    return "I am " + this.me;
};

function Bar(who) {
    Foo.call( this, who );
}
Bar.prototype = Object.create( Foo.prototype );

Bar.prototype.speak = function() {
    console.log( "Hello, " + this.identity() + ".");
};

var b1 = new Bar( "b1" );
var b2 = new Bar( "b2" );

b1.speak();
b2.speak();

And I get the following error in the console (both in chrome and nodeJS)

TypeError: this.identity is not a function at Foo.Bar.speak (/Users/gayly/Desktop/coding/YDKJS/this_and_prototypes/protoypes_exercise/exo01.js:14:32) at Object. (/Users/gayly/Desktop/coding/YDKJS/this_and_prototypes/protoypes_exercise/exo01.js:21:4)

I thought that the statement javascript Bar.prototype = Object.create( Foo.prototype ); was responsible of prototype linked the two objects and by so as identify function is not on the Foo object, the "prototype inheritance" was going to go up in the chain and find the function not in Bar but in Foo object.

Please let me know what did I miss here.

Thanks!

[getify]

identity() should have been identify()

[ygayl]

Oh thanks very much! Sorry about that! ps: Thanks for the great job you did with those books!

[getify]

No worries. :)