eshacker

function Namer(){
  console.log(this instanceof Namer);
}

Namer(); // false
new Namer(); // true
Namer.call(Namer.prototype); // false
Namer.call(new Namer); // true true
Namer.call(Namer); // false
Namer.call(Object.create(Namer.prototype)); // true

eshacker

var x = 1;

var A = {
  x : 10,
  get: function(){ return this.x; }
};

var a = A.get;
console.log(a()); // 1

eshacker

/* when there is no difference in apply and call */

// 1.

var func = function(arr, barr, carr){
  this.arr = arr;
  console.log(typeof(arr), arr.length, arr, barr, carr);
};

func.call(null, 1, 2, 3); // number undefined 1 2 3