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@@ -0,0 +1,176 @@
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+// 3 persons,different fields and fields check
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+let a = {
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+ name: 'Petro',
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+ surname: 'Petrovich',
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+ "age": '30',
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+ "fathername": 'Petroff',
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+ "sex": 'male',
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+}
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+
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+let b = {
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+ name: 'Ivan',
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+ surname: 'Ivanov',
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+ "age": '35',
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+ "fathername": 'Ivanovich',
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+ "sex": 'male',
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+}
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+
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+let c = {
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+ name: 'Sveta',
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+ surname: 'Svetova',
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+ "age": '40',
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+ "fathername": 'Serhiivna',
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+ "sex": 'female',
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+}
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+
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+if ("age" in a) {
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+ alert(a.age);
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+}
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+
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+if ("fathername" in a) {
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+ alert(a.fathername);
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+}
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+
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+if ("sex" in a) {
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+ alert(a.sex)
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+}
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+
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+if ("age" in b) {
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+ alert(b.age);
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+}
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+
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+if ("fathername" in b) {
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+ alert(b.fathername);
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+}
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+
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+if ("sex" in b) {
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+ alert(b.sex)
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+}
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+
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+if ("age" in c) {
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+ alert(c.age);
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+}
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+
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+if ("fathername" in c) {
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+ alert(c.fathername);
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+}
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+
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+if ("sex" in c) {
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+ alert(c.sex);
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+}
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+
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+// array of persons
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+
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+let persons = [a, b, c, { name: 'Olha', surname: 'Petrova', age: '45', sex: 'female' }];
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+
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+// loop of persons
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+
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+let output;
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+for (output = 0; output < persons.length; ++output) {
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+ console.log(persons[output])
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+}
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+
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+// loop of name and surname
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+
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+let outputNameAndSurname;
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+for (outputNameAndSurname = 0; outputNameAndSurname < persons.length; ++outputNameAndSurname) {
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+ console.log(persons[outputNameAndSurname].name + " " + persons[outputNameAndSurname].surname);
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+};
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+
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+// loop of loop of values
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+
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+for (let output = 0; output < persons.length; output++) {
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+ for (let key in persons[output]) {
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+ console.log(persons[output][key]);
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+ }
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+};
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+
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+// fullName
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+
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+for (let key of persons) {
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+ if (key.name && key.surname) {
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+ key.fullName = key.name + " " + key.surname;
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+ }
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+}
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+console.log(persons);
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+
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+
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+// serialize
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+
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+JSON.stringify(arrofPersons);
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+
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+// deserialize
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+
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+let d = '{"name" : "Olha","surname" : "Petrova" ,"age" : 45,"sex":"female"}'
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+d = JSON.parse(d)
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+persons[3] = d
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+console.log(persons)
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+
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+// HTML
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+
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+let str = "<table border='1'>";
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+for (let i = 0; i < 4; i++) {
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+ for (let key in persons[i]) {
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+ str += `<tr><td>${[key]}</td><td>${persons[i][key]}</td></tr>`;
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+ }
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+
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+}
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+str += "</table>";
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+console.log(str);
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+document.write(str);
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+
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+// HTML optional fields
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+
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+let strTwo = "<table border='1'>"
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+for (let i = 0; i < 4; i++) {
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+ for (let key in persons[i]) {
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+ strTwo += `<tr><td>${key}</td><td>${persons[i][key]}</td></tr>`
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+
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+
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+ }
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+} strTwo += "</table>"
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+console.log(strTwo)
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+document.write(strTwo)
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+
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+// HTML tr color
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+
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+let strThree = "<table border='1'>";
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+for (let i = 0; i < 4; i++) {
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+ for (let key in persons[i]) {
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+ strThree += `<tr style="color: blue;><td>${[key]}</td><td>${persons[i][key]
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+ }</td></tr>`;
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+ }
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+}
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+strThree += "</table>";
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+console.log(strThree);
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+document.write(strThree);
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+
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+// HTML th optional
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+
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+
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+// destruct array
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+{
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+
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+ let arr = [1, 2, 3, 4, 5, "a", "b", "c"]
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+ let [odd1, even1, odd2, even2, odd3, ...letters] = arr
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+
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+ //destruct string
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+ let arr2 = [1, "abc"]
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+ let [number, [s1, s2, s3]] = arr2
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+
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+ // destruct 2
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+
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+ let obj = {
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+ name: 'Ivan',
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+ surname: 'Petrov',
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+ children: [{ name: 'Maria' }, { name: 'Nikolay' }]
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+ }
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+
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+ let {
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+ children: [{ name: name1 }, { name: name2 }] } = obj;
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+
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+ //destruct 3
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+ let numberTwo = [1, 2, 3, 4, 5, 6, 7, 10];
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+ let [a, b, { length = numberTwo.length }] = numberTwo;
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+
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+}
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