javascript - Adding a method to a Class protoype, error -

quick question adding method object.

why errors back? checked syntax , seem correct. new javascript.

// create animal class here function animal(name, numlegs) {     this.name = name;     this.numlegs = numlegs; }  // create sayname method animal animal.prototype.sayname = function() {     console.log("hi name " + this.name); };  // test var penguin = new animal("captain cook", 2); penguin.sayname(); 

i error when trying run code

typeerror: object #<animal> has no method 'sayname' 

yeah, because you've declared method sayname small n letter.

javascript case sensitive language.