js .call code example

Example 1: call js

function Product(name, price) {
  this.name = name;
  this.price = price;

  if (price < 0)
    throw RangeError('Cannot create product "' + name + '" with a negative price');
  return this;
}

function Food(name, price) {
  Product.call(this, name, price);
  this.category = 'food';
}
Food.prototype = new Product();

function Toy(name, price) {
  Product.call(this, name, price);
  this.category = 'toy';
}
Toy.prototype = new Product();

var cheese = new Food('feta', 5);
var fun = new Toy('robot', 40);

Example 2: javascript call

function myFunc(p1, p2, pN)
{
     // here "this" equals "myThis"
}
let myThis = {};

// call myFunc using myThis as context.
// pass params to function arguments.
myFunc.call(myThis, "param1", "param2", "paramN");

Example 3: js call and apply

func.call([thisArg[, arg1, arg2, ...argN]])