Cannot set property 'name' of undefined JS

2018-06-10 03:15:35

This question already has an answer here:

How does JavaScript .prototype work? 21 answers

Objects don't have a prototype property (unless you create one). You usually only assign to the prototype property of constructors:

function Person(firstname, lastname) {
  this.firstname = firstname;
  this.lastname = lastname;
}

Person.prototype.name = 'Toby';

var A = new Person('John', 'Doe');

// A.name === 'Toby';

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