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+// //1.switch: sizes
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+// let wear = prompt('Which clothes do you need? Write your answer: outerwear/lingerie/socks', '');
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+// let size = prompt('Which size?');
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+
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+// switch(wear) {
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+// case 'outerwear' : switch(size) {
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+// case '40' : alert('S');
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+// break;
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+// case '42' : alert('M');
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+// break;
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+// case '44' : alert('M');
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+// break;
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+// case '46' : alert('L');
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+// break;
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+// case '48' : alert('L');
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+// break;
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+// };
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+// break;
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+// case 'lingerie' : switch(size) {
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+// case '42': alert('XXS');
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+// break;
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+// case '44': alert('XS');
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+// break;
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+// case '46' : alert('S');
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+// break;
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+// case '48' : alert('M');
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+// break;
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+// };
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+// break;
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+// case 'outerwear' : switch(size) {
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+// case '21': alert('8');
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+// break;
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+// case '23': alert('9');
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+// break;
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+// case '25' : alert('10');
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+// break;
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+// };
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+// break;
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+// };
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+
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+//2.switch: if
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+// let color = 'green';
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+// if (color === 'red') {
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+// console.log('red', 'black');
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+// }
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+// else if (color === 'black') {
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+// console.log('black');
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+// }
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+// else if (color === 'blue') {
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+// console.log('blue', 'green');
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+// }
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+// else if (color === 'green') {
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+// console.log('green');
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+// }
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+// else {
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+// console.log('something');
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+// }
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+
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+//3.prompt: or
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+// let age = parseInt(prompt('How old are you?', ""));
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+// let currentYear = (new Date()).getFullYear();
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+// if(isNaN(age) || age === "" || age === null) {
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+// alert('Error!');
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+// }
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+// else if (age < 0){
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+// alert('You made mistake');
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+// }
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+// else if(age > 0){
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+// alert(`${currentYear - age} is your year of Born`);
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+// }
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+
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+
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+//4.confirm: or this days, 5.confirm: if this days
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+// let word = prompt('шопинг?', '');
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+// if (word === '' || word === null || !isNaN(word)) {
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+// alert('ты - бяка');
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+// }
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+// else if(word === 'да') {
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+// alert('Yes');
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+// }
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+// else {
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+// alert("I didn't understand you")
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+// }
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+
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+
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+//6.triple prompt
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+// let surname = prompt('Твоя фамилия?', "");
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+// let name = prompt('Твое имя?', "");
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+// let fatherName = prompt('Отчество?', "");
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+// alert(`Здравствуйте, ${surname} ${name} ${fatherName}!`);
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+
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+//7.default: or, 8.default: if
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+// let surname = prompt('Твоя фамилия?', "");
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+// let username = prompt('Твое имя?', "");
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+// let fatherName = prompt('Отчество?', "");
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+
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+// if(surname === "" || surname === null || surname === undefined || !isNaN(surname)) {
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+// surname = 'Иванов';
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+// };
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+// if(username === "" || username === null || username === undefined || !isNaN(username)) {
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+// username = 'Иван';
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+// };
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+// if(fatherName == "" || fatherName === null || fatherName === undefined || !isNaN(fatherName)) {
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+// fatherName = 'Иванович';
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+// };
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+// alert(`Здравствуйте, ${surname} ${username} ${fatherName}!`);
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+
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+
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+//9.login and password
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+// let log = prompt('Your login');
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+// let pswd;
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+
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+// if(log === 'admin') {
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+// pswd = prompt('Your password');
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+// if(pswd === 'qwerty') {
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+// alert('Welcome!');
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+// }
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+// else{
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+// alert('Wrong password!');
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+// }
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+// }
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+// else {
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+// alert('Wrong login!');
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+// }
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+
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+//10.currency calc
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+// let currency = (prompt(' "usd" или "eur"?', "")).toLowerCase();
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+// switch(currency){
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+// case 'usd': let money = prompt('Сколько гривен?', "");
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+// let dol = money * 26.1;
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+// alert(`${dol} Долларов`);
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+// break;
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+// case 'eur': let grn = prompt('Сколько гривен?', "");
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+// let euro = grn * 29.9;
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+// alert(`${euro} Евро`);
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+// break;
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+// default : console.log('Error!');
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+// }
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+
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+//11.currency calc: improved
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+// let currency = (prompt(' "usd" или "eur"?', "")).toLowerCase();
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+
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+// switch(currency){
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+// case 'usd': let money = prompt('Сколько гривен?', "");
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+// let dol = ((money / 26.1).toFixed(2));
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+// alert(`${dol} Долларов`);
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+// break;
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+// case 'eur': let grn = prompt('Сколько гривен?', "");
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+// let euro = ((grn / 29.9).toFixed(2));
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+// alert(`${euro} Евро`);
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+// break;
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+// default : console.log('Error!');
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+// }
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+
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+// 12.currency calc: two rates
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+// let currency = confirm(' "Из usd в гривны"?', "");
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+// let usd;
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+// let grn;
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+// currency === true ? (
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+// usd = prompt('Сколько usd?', ""),
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+// alert(`${(usd * 26.5).toFixed(2)} гривен`)
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+// ) : (
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+// grn = prompt('Сколько гривен?', ""),
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+// alert(`${(grn / 26.1).toFixed(2)} usd`)
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+// );
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+
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+//13.currency calc: if
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+// let currency = (confirm(' "Из usd или eur в гривны"?', "")).toLowerCase();
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+// if(currency === true) {
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+// let cur = (prompt('Из usd или eur"?')).toLowerCase();
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+// if ( cur === 'usd'){
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+// let usd = prompt('Сколько usd?', "");
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+// let grn_usd = ((usd * 26.5).toFixed(2));
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+// alert(`${grn_usd} гривен`);
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+// }
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+// else if (cur === 'eur'){
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+// let eur = prompt('Сколько eur?', "");
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+// let grn_eur = ((eur * 30).toFixed(2));
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+// alert(`${grn_eur} гривен`);
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+// }
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+// }
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+// else if(currency === false){
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+// let grnToCur = (prompt('Из гривен в usd или eur"?')).toLowerCase();
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+// if ( grnToCur === 'usd'){
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+// let grn = prompt('Сколько гривен?', "");
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+// let grnToUsd = ((grn / 26.1).toFixed(2));
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+// alert(`${grnToUsd} usd`);
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+// }
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+// else if (grnToCur === 'eur'){
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+// let gr = prompt('Сколько гривен?', "");
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+// let grnToEur = ((gr / 30).toFixed(2));
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+// alert(`${grnToEur} eur`);
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+// }
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+// }
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+// else {
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+// alert('Error!');
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+// }
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+
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+//14.scissors, 17.Задание на черный пояс
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+// let yourChoise = (prompt('камень, ножницы или бумага?', "")).toLowerCase();
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+// let compChoise = Math.random();
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+
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+// if(compChoise <= 0.33) {
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+// compChoise = 'камень';
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+// }
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+// else if (compChoise <= 0.66) {
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+// compChoise = 'ножницы';
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+// }
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+// else {
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+// compChoise = 'бумага';
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+// }
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+
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+// if(yourChoise === "" || yourChoise === null || yourChoise === undefined || !isNaN(yourChoise)){
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+// alert('Error!');
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+// }
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+// else if (yourChoise === compChoise) {
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+// alert('Draw');
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+// }
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+// else if((yourChoise === "камень" && compChoise ==="ножницы") || (yourChoise === "бумага" && compChoise ==="камень") ||
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+// (yourChoise === "ножницы" && compChoise ==="бумага")) {
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+// alert(`You won! The computer chose ${compChoise}`);
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+// }
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+// else {
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+// alert(`Computer won! Because he chose ${compChoise}`);
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+// }
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+
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+
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+
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+//15.Задание на синий пояс
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+// let ratios = new Map([
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+// ['usd', '25.6'],
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+// ['eur', '29']
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+// ]);
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+// let currency = (prompt('Конвертировать в usd или eur?')).toLowerCase();
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+// // let currency = 'usd';
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+// let grn = prompt(`Сколько грн вы хотите конвертировать в ${currency}?`);
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+// // let grn = 1000;
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+
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+// if (currency === 'usd') {
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+// alert((grn / ratios.get('usd')).toFixed(2));
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+// }
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+// else if (currency === 'eur'){
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+// alert((grn / ratios.get('eur')).toFixed(2));
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+// }
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+// else {
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+// alert('Error');
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+// }
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+
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+
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+//16.real data
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+// let currency = (confirm(' "Из usd или eur в гривны"?', "")).toLowerCase();
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+// if(currency === true) {
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+// let cur = (prompt('Из usd или eur"?')).toLowerCase();
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+// if ( cur === 'usd'){
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+// fetch('https://open.er-api.com/v6/latest/USD').then(res => res.json())
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+// .then(data => {
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+// let rate_uah = data.rates.UAH;
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+// let usd = prompt('Сколько usd?', "");
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+// alert(`${(usd * rate_uah).toFixed(2)} гривен`);
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+// });
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+// }
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+// else if (cur === 'eur'){
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+// fetch('https://open.er-api.com/v6/latest/EUR').then(res => res.json())
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+// .then(data => {
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+// let rate_grn = data.rates.UAH;
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+// let eur = prompt('Сколько eur?', "");
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+// alert(`${(eur * rate_grn).toFixed(2)} гривен`);
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+// });
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+// }
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+// }
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+// else if(currency === false){
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+// let grnToCur = (prompt('Из гривен в usd или eur"?')).toLowerCase();
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+// if ( grnToCur === 'usd'){
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+// fetch('https://open.er-api.com/v6/latest/UAH').then(res => res.json())
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+// .then(data => {
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+// let rate_usd = data.rates.USD;
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+// let grn = prompt('Сколько гривен?', "");
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+// alert(`${(grn * rate_usd).toFixed(2)} usd`);
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+// });
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+// }
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+// else if (grnToCur === 'eur'){
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+// fetch('https://open.er-api.com/v6/latest/UAH').then(res => res.json())
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+// .then(data => {
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+// let rate_eur = data.rates.EUR;
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+// let gr = prompt('Сколько гривен?', "");
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+// alert(`${(gr * rate_eur).toFixed(2)} eur`);
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+// });
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+// }
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+// }
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+// else {
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+// alert('Error!');
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+// }
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