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@@ -0,0 +1,67 @@
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+//3 persons
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+//different fields
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+//fields check
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+let a = {
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+ name : "Johnny",
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+ surname : "Depp",
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+}
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+a.age = 59;
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+
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+let b = {
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+ name : "Brad",
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+ surname : "Pitt",
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+}
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+b.fathername = "William";
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+
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+let c = {
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+ name : "Leonardo",
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+ surname : "Dicaprio",
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+}
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+
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+c.sex = "man";
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+
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+if ("age" in a) {
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+ alert("age in a")
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+}
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+if ("fathername" in b) {
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+ alert("fathername in b")
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+}
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+if ("sex" in c){
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+ alert("sex in c")
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+}
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+
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+//array of persons
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+
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+a = {
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+ name : "Johnny",
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+ surname : "Depp",
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+};
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+b = {
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+ name : "Brad",
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+ surname : "Pitt",
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+};
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+c = {
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+ name : "Leonardo",
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+ surname : "Dicaprio",
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+};
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+
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+let persons = [a, b, c];
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+let d = {
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+ name : "Vasya",
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+ surname : "Pupkin",
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+};
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+persons.push(d)
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+
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+//loop of persons
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+
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+for(let i in persons){
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+ console.log(persons[i])
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+};
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+
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+//loop of name and surname
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+for(let i in persons){
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+ console.log(persons[i].name,
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+ persons[i].surname)
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+};
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+
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+//loop of loop of values
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Анатолий Пивоварский