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+// const taskName = prompt('Enter task name');
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+
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+// switch (taskName) {
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+// case 'switch: sizes': const sizeRus = prompt('enter size');
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+
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+// switch (sizeRus) {
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+// case '40': alert('I 38, GB 8, USA 6');
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+// break;
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+
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+// case '42': alert('I 40, GB 10, USA 8');
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+// break;
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+
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+// case '44': alert('I 42, GB 12, USA 10');
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+// break;
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+
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+// case '46': alert('I 44, GB 14, USA 12');
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+// break;
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+
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+// case '48': alert('I 46, GB 16, USA 14');
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+// break;
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+
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+// case '50': alert('I 48, GB 18, USA 16');
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+// break;
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+// };
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+// break;
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+
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+// case 'switch: if': let color = prompt("Введите цвет","");
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+
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+// if (color === "red") {
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+// document.write("<div style='background-color: red;'>красный</div>");
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+// document.write("<div style='background-color: black; color: white;'>черный</div>");
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+// }
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+// else if (color === "black") {
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+// document.write("<div style='background-color: black; color: white;'>черный</div>");
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+// }
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+// else if (color === "blue") {
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+// document.write("<div style='background-color: blue;'>синий</div>");
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+// document.write("<div style='background-color: green;'>зеленый</div>");
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+// }
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+// else if (color === "green") {
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+// document.write("<div style='background-color: green;'>зеленый</div>");
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+// }
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+// else {
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+// document.write("<div style='background-color: gray;'>Я не понял</div>");
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+// };
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+// break;
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+
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+// case 'prompt: or': const age = +(prompt('Your age')); console.log(age);
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+// const yearPresent = 2021;
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+// let ageNew;
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+
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+// if ( age == "" || age === null ) {
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+// ageNew = +prompt('Please writing your age');
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+// }; console.log(ageNew);
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+
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+// if (ageNew === null || ageNew == "") {
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+// alert('It is not interested for you');
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+// };
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+// if (age !== "" || ageNew !== "" || typeof(age) === 'number') {
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+// const yearBirth = yearPresent - ageNew;
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+// const yearBirth1 = yearPresent - age;
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+// alert(` ${yearBirth1} ${yearBirth}`);
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+// };
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+// break;
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+
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+// case 'confirm: or this days': const shoping = confirm('Shoping?'); console.log(shoping);
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+// shoping || alert(`you are biaka`);
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+// break;
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+
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+// case 'confirm: if this days': const shoping = confirm('Shoping?'); console.log(shoping);
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+// if (shoping === false) {
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+// alert(`you are biaka`);
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+// };
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+// break;
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+
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+// case 'triple prompt': const surname = prompt('enter surname');
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+// const userName = prompt('enter name');
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+// const patronymic = prompt('patronymic');
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+
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+// alert(`Full name ${surname} ${userName} ${patronymic} `);
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+// break;
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+
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+// case 'default: or': const surname = prompt('enter surname');
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+// const userName = prompt('enter name');
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+// const patronymic = prompt('patronymic');
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+
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+// alert(`Full name ${surname || 'Ivanov'} ${userName || 'Ivanov'} ${patronymic || 'Ivanov'} `);
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+
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+// break;
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+
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+// case 'default: if': let surname = prompt('enter surname');
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+// let userName = prompt('enter name');
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+// let patronymic = prompt('patronymic');
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+// //1)
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+// if (surname === null || surname === "") {
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+// surname = 'Ivanov';
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+// };
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+// if (userName === null || userName === ""){
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+// userName = 'Ivanov';
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+// };
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+// if (patronymic === null || patronymic ==="") {
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+// patronymic = 'Ivanov';
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+// } ;
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+// alert(`Full name ${surname} ${userName} ${patronymic} `);
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+
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+// //2)
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+// if ((surname === null || surname === "") && (userName === null || userName === "") && (patronymic === null || patronymic ==="") ) {
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+// alert('Ivanov Ivanov Ivanov');
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+// } else if (surname === null || surname === "") {
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+// surname = 'Ivanov';
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+// alert(`Full name ${surname} ${userName} ${patronymic} `);
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+// } else if (userName === null || userName === ""){
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+// userName = 'Ivanov';
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+// alert(`Full name ${surname} ${userName} ${patronymic} `);
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+// } else if (patronymic === null || patronymic ==="") {
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+// patronymic = 'Ivanov';
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+// alert(`Full name ${surname} ${userName} ${patronymic} `);
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+// } ;
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+// break;
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+
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+// case 'login and password': const login = "admin";
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+// const password = "qwerty";
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+// const useLogin = prompt('Enter login');
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+// let usePassword;
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+
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+// if (login === useLogin) {
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+// usePassword = prompt('Enter password');
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+// };
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+// if (login !== useLogin || password !== usePassword) {
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+// alert('Error');
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+// } else alert('Good!');
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+// break;
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+
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+// case 'currency calc': const currency = prompt('select currency: usd or eur' ).toLowerCase();
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+// let monyHr;
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+// switch (currency) {
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+// case 'usd': monyHr = 27;
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+// break;
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+// case 'eur': monyHr = 30;
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+// break;
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+// };
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+// const hryvnias = prompt('how much UAH');
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+// alert(`${currency} ${hryvnias / monyHr}`);
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+// break;
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+
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+// case 'currency calc: two rates': const currency = prompt('select currency: usd or eur' ).toLowerCase();
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+// const question = confirm('Do You want to buy currency?');
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+// const amount = prompt('Money');
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+// let monyHr;
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+
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+// switch (currency) {
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+// case 'usd': monyHr = 27;
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+// break;
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+// case 'eur': monyHr = 30;
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+// break;
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+// };
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+
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+// question ? alert(`${currency} ${amount / monyHr}`) : alert(`hryvnias ${amount * monyHr}`);
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+// break;
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+
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+// case 'currency calc: if': const currency = prompt('select currency: usd or eur' ).toLowerCase();
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+// const question = confirm('Do You want to buy currency?');
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+// const amount = prompt('Money');
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+// let monyHr;
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+
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+// if (currency === 'usd') {
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+// monyHr = 27;
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+// };
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+// if (currency === 'eur') {
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+// monyHr = 30;
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+// };
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+// if (question) {
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+// alert(`${currency} ${amount / monyHr}`);
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+// } else alert(`hryvnias ${amount * monyHr}`);
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+// break;
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+
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+// case 'scissors': const things = ['rock', 'scissors', 'paper'];
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+// const userThing = prompt('choose rock or paper or scissors');
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+// const randomThings = things[ Math.floor(Math.random()*things.length)];
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+// alert(randomThings);
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+
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+// if ((userThing === 'rock') && (randomThings === 'scissors')) {
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+// alert('you are winner!');
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+// } else if ((userThing === 'scissors') && (randomThings === 'paper')) {
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+// alert('you are winner!');
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+// } else if ((userThing === 'paper') && (randomThings === 'rock')) {
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+// alert('you are winner!');
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+// } else if (randomThings === userThing) {
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+// alert('no one is a winner');
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+// } else alert('you lose');
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+// break;
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+
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+// case 'Задание на синий пояс': let ratios = {
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+// usd: 25.6,
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+// eur: 29
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+// };
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+// const currency = prompt('select currency: usd or eur' ).toLowerCase();
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+// const question = confirm('Do You want to buy currency?');
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+// const amount = prompt('Money');
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+// const monyHr = ratios[currency];
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+
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+// question ? alert(`${currency} ${amount / monyHr}`) : alert(`hryvnias ${amount * monyHr}`);
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+// break;
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+
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+// case 'real data': const amountMoney = prompt('Enter Money');
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+
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+// fetch('https://open.er-api.com/v6/latest/USD').then(res => res.json())
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+// .then(data => {
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+// console.log(data.rates.UAH)
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+// alert(`UAN ${amountMoney * data.rates.UAH}`)
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+
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+// });
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+// break;
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+// };
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+
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+
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+//Task
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+const things = ['rock', 'scissors', 'paper'];
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+const userThing = prompt('choose rock or paper or scissors');
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+const randomThings = things[ Math.floor(Math.random()*things.length)];
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+alert(randomThings);
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+
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+((userThing === 'rock') && (randomThings === 'scissors') && !(alert('you are winner!'))) ||
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+((userThing === 'scissors') && (randomThings === 'paper') && !(alert('you are winner!'))) ||
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+((userThing === 'paper') && (randomThings === 'rock') && !(alert('you are winner!'))) ||
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+((randomThings === userThing) && !(alert('no one is a winner'))) ||
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+!(alert('you lose'));
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Vika