prototype issue in JavaScript

Question

I have the following piece of code:

function University(name) {
    this.name = name
}
University.prototype = {
    sayName: function() {
        console.log(this.name)
    },
    toString: function() {
        console.log("WUSTL")
    }
};
var univ = new University("Washington University");
console.log(univ instanceof University);
console.log(univ.constructor == University); // false
console.log(univ.constructor == Object);     // true

can anybody help to explain why the constructor of the instance of 'University' got changed to Object instead of University?

You need to reset the prototype whenever you overwrite the it: University.prototype.constructor = University;. An useful link about Prototypes. — Vidul
– Vidul, Commented Oct 25, 2015 at 2:22

Paul Kienitz · Accepted Answer · 2015-10-25 02:18:57Z

3

Because you overwrote the original prototype which knew the identity of the constructor.

answered Oct 25, 2015 at 2:18

Paul Kienitz

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