02_arrow_functions_callbacks.js

// Error handling in JavaScript

// function declaration
// f1();
function f1() {
  console.log("f1 called");
}

// function expression

// f2();
var f2 = function () {
  console.log("f2 called");
};

// Arrow function
// f3();
var f3 = () => {
  console.log("f3 called");
};
f3();

const f4 = (userName) => {
  console.log("f4 called with userName: " + userName);
};
// f4("Ashish choudhary");

const f5 = (userName) => {
  return "f5 called with userName: " + userName;
};
// console.log(f5());
// console.log(f5('Ashish choudhary'));

function sayHello(fun) {
  fun("Ashish choudhary");
}

sayHello((userName) => {
  return "Hello " + userName;
});
sayHello((userName) => {
  console.log("Hello " + userName);
});

// arguments object

function f6() {
  console.log(arguments[0]);
}

f6(12, 14);

//
function f7() {
  for (let k in arguments) {
    // console.log(k, arguments[0]);
  }
}

f7(12, 14, 50, 70, 60);

// constructor function

function Person(name, age) {
  this.name = name;
  this.age = age;
  console.log(this) 
}

let p1 = new person('amit',21)