Get name of object or class

Get your object's constructor function and then inspect its name property.

myObj.constructor.name

Returns "myClass".

Example:

function Foo () { console.log('Foo function'); }
var f = new Foo();
console.log('f', f.constructor.name); // -> "Foo"

var Bar = function () { console.log('Anonymous function (as Bar)'); };
var b = new Bar();
console.log('b', b.constructor.name); // -> "Bar"

var Abc = function Xyz() { console.log('Xyz function (as Abc)'); };
var a = new Abc();
console.log('a', a.constructor.name); // -> "Xyz"

class Clazz { constructor() { console.log('Clazz class'); } }
var c = new Clazz();
console.log('c', c.constructor.name); // -> "Clazz"

var otherClass = class Cla2 { constructor() { console.log('Cla2 class (as otherClass)'); } }
var c2 = new otherClass();
console.log('c2', c2.constructor.name); // -> "Cla2"

As this was already answered, I just wanted to point out the differences in approaches on getting the constructor of an object in JavaScript. There is a difference between the constructor and the actual object/class name. If the following adds to the complexity of your decision then maybe you're looking for instanceof. Or maybe you should ask yourself "Why am I doing this? Is this really what I am trying to solve?"

Notes:

The obj.constructor.name is not available on older browsers. Matching (\w+) should satisfy ES6 style classes.

Code:

var what = function(obj) {
  return obj.toString().match(/ (\w+)/)[1];
};

var p;

// Normal obj with constructor.
function Entity() {}
p = new Entity();
console.log("constructor:", what(p.constructor), "name:", p.constructor.name , "class:", what(p));

// Obj with prototype overriden.
function Player() { console.warn('Player constructor called.'); }
Player.prototype = new Entity();
p = new Player();
console.log("constructor:", what(p.constructor), "name:", p.constructor.name, "class:", what(p));

// Obj with constructor property overriden.
function OtherPlayer() { console.warn('OtherPlayer constructor called.'); }
OtherPlayer.constructor = new Player();
p = new OtherPlayer();
console.log("constructor:", what(p.constructor), "name:", p.constructor.name, "class:", what(p));

// Anonymous function obj.
p = new Function("");
console.log("constructor:", what(p.constructor), "name:", p.constructor.name, "class:", what(p));

// No constructor here.
p = {};
console.log("constructor:", what(p.constructor), "name:", p.constructor.name, "class:", what(p));

// ES6 class.
class NPC { 
  constructor() {
  }
}
p = new NPC();
console.log("constructor:", what(p.constructor), "name:", p.constructor.name , "class:", what(p));

// ES6 class extended
class Boss extends NPC {
  constructor() {
    super();
  }
}
p = new Boss();
console.log("constructor:", what(p.constructor), "name:", p.constructor.name , "class:", what(p));

Result:

Code: https://jsbin.com/wikiji/edit?js,console