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| 1 | function Person(firstname, lastname) {
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| 2 | - | this.firstname = firstname; |
| 2 | + | |
| 3 | - | this.lastname = lastname; |
| 3 | + | var prototype = Object.getPrototypeOf(this); |
| 4 | prototype.firstname = firstname; | |
| 5 | - | if (!Person.prototype.getFullname) {
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| 5 | + | prototype.lastname = lastname; |
| 6 | - | Person.prototype.getFullname = function () {
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| 6 | + | |
| 7 | - | return this.firstname + ' ' + this.lastname; |
| 7 | + | |
| 8 | - | }; |
| 8 | + |
