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function getResponse(url) {
	return new Promise(function(success, failure) {
  var request = new XMLHttpRequest();
	request.open('GET', url);
	
  request.onload = function() {
    if (request.status == 200) {
      return success(request.response);
    } else {
      return failure("Error in processing..!" + request.status);
    }
  }
  request.onerror = function() {
    return failure("Error in processing ");
  }
  request.send();
  });
}

function getUsername(response) {
  response = JSON.parse(response);
  return response["login"];
}

function makeUsernameCaps(name) {
	return new Promise(function(success, failure) {
  	// Let's assume it takes 3secs to make the username caps :) 
  	setTimeout(function() {
    success(name.toUpperCase());
    }, 3000)
  });
}
async function apiCall(url) {
  let response = await getResponse(url); 
  let username = await getUsername(response);
  let username_in_caps = await makeUsernameCaps(username);
  return username_in_caps;
}

apiCall("https://api.github.com/users/srebalaji")
.then(function(x) {
	console.log(x);
})
.catch(function(x) {
	console.log("Error - "+x);
});

async function Max(a, b) {
 if (a > b) {
  return Promise.resolve("Success");
 }
 else {
  return Promise.reject("Error");
 }
}

Max(4, 10)
.then(function(x) {
 console.log("Good " + x); 
})
.catch(function(x) {
 console.log("Oops " + x); 
});

Output:
Oops Error

// If we pass Max(14, 10) then we should get "Good Success" :)

async function hello(a, b) {
 if (a < b) {
  return "Greater";
 }
 else {
  return new Error("Not Greater");
 }
}

hello(14, 10)
.then(function(x) {
 console.log("Good..! " + x); 
})
.catch(function(x) {
 console.log("Oops..! " + x); 
})

Output:
Oops..! Not Greater. 

// if you call hello(4, 10) you get "Good..! Greater"

var ApiCall = new Promise(function(resolve, reject) {
  
  var request = new XMLHttpRequest();
  request.open('GET', 'https://api.github.com/users/srebalaji');

  request.onload = function() {
    if (request.status == 200) {
      
      resolve(request.response);
    } else {
      reject(Error(request.statusText));
    }
  }

  request.send();
});

ApiCall
.then(function(x) {
  document.getElementById('response').innerHTML = x;
})
.catch(function(x) {
	document.getElementById('response').innerHTML = x;
})