// const taskName = prompt('Enter task name');

// switch (taskName) {
//   case 'switch: sizes': const sizeRus = prompt('enter size');

//                          switch (sizeRus) {
//                           case '40': alert('I 38, GB 8, USA 6');
//                                     break;
                          
//                           case '42': alert('I 40, GB 10, USA 8');
//                                     break;
                        
//                           case '44': alert('I 42, GB 12, USA 10');
//                                     break;
                        
//                           case '46': alert('I 44, GB 14, USA 12');
//                                     break;
                        
//                           case '48': alert('I 46, GB 16, USA 14');
//                                     break;
                        
//                           case '50': alert('I 48, GB 18, USA 16');
//                                     break;
//                          };
//                         break;

//   case 'switch: if': let color = prompt("Введите цвет","");

//                       if (color === "red") {
//                         document.write("<div style='background-color: red;'>красный</div>");
//                         document.write("<div style='background-color: black; color: white;'>черный</div>");
//                       }
//                         else if (color === "black") {
//                         document.write("<div style='background-color: black; color: white;'>черный</div>");
//                       }
//                         else if (color === "blue") {
//                         document.write("<div style='background-color: blue;'>синий</div>");
//                         document.write("<div style='background-color: green;'>зеленый</div>");
//                       }
//                         else if (color === "green") {
//                         document.write("<div style='background-color: green;'>зеленый</div>");
//                       }
//                         else {
//                       document.write("<div style='background-color: gray;'>Я не понял</div>");
//                       }; 
//                       break;

//   case 'prompt: or':  const age = +(prompt('Your age')); console.log(age);
//                       const yearPresent = 2021; 
//                       let ageNew; 
                      
//                       if ( age == "" || age === null ) {
//                         ageNew = +prompt('Please writing your age');
//                       }; console.log(ageNew);
                      
//                       if (ageNew === null || ageNew == "") {
//                         alert('It is not interested for you');
//                       };  
//                       if (age !== "" || ageNew !== "" || typeof(age) === 'number') {
//                         const yearBirth = yearPresent - ageNew;
//                         const yearBirth1 = yearPresent - age;
//                         alert(` ${yearBirth1} ${yearBirth}`);
//                       };
//                       break;

//   case 'confirm: or this days': const shoping = confirm('Shoping?'); console.log(shoping);
//                                 shoping || alert(`you are biaka`);
//                                 break;
                        
//   case 'confirm: if this days': const shoping = confirm('Shoping?'); console.log(shoping);
//                                 if (shoping === false) {
//                                   alert(`you are biaka`);
//                                 };
//                                 break;

//   case 'triple prompt': const surname = prompt('enter surname');
//                         const userName = prompt('enter name');
//                         const patronymic = prompt('patronymic');
                        
//                         alert(`Full name ${surname} ${userName} ${patronymic} `);
//                         break;

//   case 'default: or': const surname = prompt('enter surname');
//                       const userName = prompt('enter name');
//                       const patronymic = prompt('patronymic');
                      
//                       alert(`Full name ${surname || 'Ivanov'} ${userName || 'Ivanov'} ${patronymic || 'Ivanov'} `);

//                       break;

//   case 'default: if': let surname = prompt('enter surname'); 
//                       let userName = prompt('enter name');
//                       let patronymic = prompt('patronymic');
//                       //1)
//                       if (surname === null || surname === "") {
//                         surname = 'Ivanov';
//                       };
//                       if (userName === null || userName === ""){
//                         userName = 'Ivanov'; 
//                       };  
//                       if (patronymic === null || patronymic ==="") {
//                         patronymic = 'Ivanov';
//                       } ;
//                       alert(`Full name ${surname} ${userName} ${patronymic} `);
                      
//                       //2)
//                       if ((surname === null || surname === "") && (userName === null || userName === "") && (patronymic === null || patronymic ==="") ) {
//                         alert('Ivanov Ivanov Ivanov');
//                       } else if (surname === null || surname === "") {
//                           surname = 'Ivanov';
//                           alert(`Full name ${surname} ${userName} ${patronymic} `);
//                       } else if (userName === null || userName === ""){
//                           userName = 'Ivanov'; 
//                           alert(`Full name ${surname} ${userName} ${patronymic} `);
//                       } else if (patronymic === null || patronymic ==="") {
//                           patronymic = 'Ivanov';
//                           alert(`Full name ${surname} ${userName} ${patronymic} `);
//                       } ;
//                       break;

//   case 'login and password': const login = "admin";
//                             const password = "qwerty";
//                             const useLogin = prompt('Enter login');
//                             let usePassword;
                            
//                             if (login === useLogin) {
//                               usePassword = prompt('Enter password');
//                             };
//                             if (login !== useLogin || password !== usePassword) {
//                               alert('Error');
//                             } else alert('Good!');
//                             break;

//   case 'currency calc': const currency = prompt('select currency: usd or eur' ).toLowerCase();
//                         let monyHr;
//                         switch (currency) {
//                           case 'usd': monyHr = 27;
//                                     break; 
//                           case 'eur': monyHr = 30;
//                                     break; 
//                         };
//                         const hryvnias = prompt('how much UAH'); 
//                         alert(`${currency} ${hryvnias / monyHr}`);
//                         break;

//   case 'currency calc: two rates': const currency = prompt('select currency: usd or eur' ).toLowerCase();
//                                     const question = confirm('Do You want to buy currency?');
//                                     const amount = prompt('Money');
//                                     let monyHr;
                                    
//                                     switch (currency) {
//                                       case 'usd': monyHr = 27;
//                                                 break; 
//                                       case 'eur': monyHr = 30;
//                                                 break; 
//                                     };
                                    
//                                     question ? alert(`${currency} ${amount / monyHr}`) : alert(`hryvnias ${amount * monyHr}`);
//                                     break;

//   case 'currency calc: if': const currency = prompt('select currency: usd or eur' ).toLowerCase();
//                             const question = confirm('Do You want to buy currency?');
//                             const amount = prompt('Money');
//                             let monyHr;
                            
//                             if (currency === 'usd') {
//                               monyHr = 27;
//                             };
//                             if (currency === 'eur') {
//                               monyHr = 30;
//                             };
//                             if (question) {
//                               alert(`${currency} ${amount / monyHr}`);
//                             } else alert(`hryvnias ${amount * monyHr}`);
//                             break;

//   case 'scissors': const things = ['rock', 'scissors', 'paper'];
//                    const userThing = prompt('choose rock or paper or scissors');
//                    const randomThings = things[ Math.floor(Math.random()*things.length)]; 
//                    alert(randomThings);
                  
//                    if ((userThing === 'rock') && (randomThings === 'scissors')) {
//                     alert('you are winner!');
//                    } else if ((userThing === 'scissors') && (randomThings === 'paper')) {
//                     alert('you are winner!');
//                    } else if ((userThing === 'paper') && (randomThings === 'rock')) {
//                     alert('you are winner!');
//                    } else if (randomThings === userThing) {
//                     alert('no one is a winner');
//                    } else alert('you lose');
//                    break;

//   case 'Задание на синий пояс': let ratios = {
//                                               usd: 25.6,
//                                               eur: 29
//                                             };
//                                 const currency = prompt('select currency: usd or eur' ).toLowerCase();
//                                 const question = confirm('Do You want to buy currency?');
//                                 const amount = prompt('Money');
//                                 const monyHr = ratios[currency];
                                
//                                 question ? alert(`${currency} ${amount / monyHr}`) : alert(`hryvnias ${amount * monyHr}`);
//                                 break;

//   case 'real data': const amountMoney = prompt('Enter Money');

//                     fetch('https://open.er-api.com/v6/latest/USD').then(res => res.json())
//                     .then(data => {
//                           console.log(data.rates.UAH)
//                           alert(`UAN ${amountMoney * data.rates.UAH}`)
                          
//                       });
//                       break;
// };


//Task
const things = ['rock', 'scissors', 'paper'];
const userThing = prompt('choose rock or paper or scissors');
const randomThings = things[ Math.floor(Math.random()*things.length)]; 
alert(randomThings);

((userThing === 'rock') && (randomThings === 'scissors') && !(alert('you are winner!'))) ||
((userThing === 'scissors') && (randomThings === 'paper') && !(alert('you are winner!'))) || 
((userThing === 'paper') && (randomThings === 'rock') && !(alert('you are winner!'))) || 
((randomThings === userThing) && !(alert('no one is a winner'))) ||
!(alert('you lose'));