shahab570

promise.then(
  (value) => {
    /* run when promise resolved */
  },
  (error) => {
    /* run when promise rejected */
  }
);

shahab570

const promise = new Promise((resolve, reject) => {
  has_money = false;
  setTimeout(() => {
    if (has_money) {
      resolve("Here is your car. Enjoy your ride");
    } else {
      reject("Sorry, I don't have money to buy car");
    }
  }, 5000);
});

shahab570

const promise = new Promise((resolve, reject) => {
  has_money = true;
  setTimeout(() => {
    if (has_money) {
      resolve("Here is your car. Enjoy your ride");
    } else {
      reject("Sorry, I don't have money to buy car");
    }
  }, 5000);
});

shahab570

function square(x,result = x *x ) {
  console.log(result);
}
square(5);         //25
square(6) ;        //36

shahab570

function number() {
  return 10;
}
function result (x ,y =number()) {
  console.log(x+y);
}
result(2);         //12
result(10,20)      //30

shahab570

function identity(name = "John",age = 25) {
  console.log(name, " ", age);
}
identity();           //John 25
identity("Harris");   //Harris 25

shahab570

function abc(x,y) {
  if (x === undefined) {
    x = 100;
  }
  if (y === undefined) {
    y = 50;
  }
  console.log(x,y);
}

shahab570

function abc(x,y) {
  //we used logical OR(||)  operator. It returns the first truthy value. 
  //if first value is undefined, second value is returned
  x = x || 100;    
 // value of x is x which is given at the function call. If not given value is 100
  y = y || 50; 
 // value of y is y which is given at the function call. If not given value is 50
  console.log(x,y);
}

shahab570

function abc(a,b) {    // a and b are called parameters
  //code
}
abc(c,d);              // c and d are called arguments

shahab570

//style.css
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box; }

body {
  width: 100%;
  height: 100vh;
  background-color: #0f3057;