Перезалив

file.js

@@ -0,0 +1,167 @@
+// 3 persons //different fields //fields check
+
+let a = {
+    "name": "Jimmy",
+    "surname": "Dick",
+    };
+    a.sex = "male";
+    let b = {
+    "name": "Sara",
+    "surname":"Conor",
+    };
+    b.fathername = "Leonidovna"
+    let c = {
+    "name": "Stan",
+    "surname": "Jopa",
+    };
+    c.age = 18;
+    if ("sex" in a  ){
+        alert("Sex in a")
+    }if ("fathername" in  b  ){
+        alert("fathername in b")
+    }if ("age" in  c ){
+        alert("age in c")}
+    
+    // array of persons
+    
+            a = {
+            "name": "Jimmy",
+            "surname": "Dick",
+            
+            },
+            b = {
+            "name": "Sara",
+            "surname":"Conor",
+            
+            },
+            c = {
+            "name": "Stan",
+            "surname": "Jopa",
+            
+            }
+    let persons = [a, b, c];
+        let d = {
+        "name":"Gregor",
+        "surname":"Clit",
+        
+      };
+      persons.push(d)
+      
+    
+    
+    // loop of persons
+    
+    for(let i in persons){
+        console.log(persons[i])
+    };
+    
+    // loop of name and surname
+    
+    for( i in persons){
+        console.log(persons[i].name, persons[i].surname);
+    }
+    
+    // loop of loop of values 
+    
+    for( i in persons){
+        for(values in persons[i]){
+    console.log(persons[i][values])}}
+    
+    // fullName???
+    
+    if("fathername" in a ){
+        persons[0].fullName = "fullName"
+    }else if("fathername" in a ){
+        persons[1].fullName = "fullName"
+    }else if("fathername" in a ){
+        persons[2].fullName = "fullName"
+    }else if("fathername" in a ){
+        persons[3].fullName = "fullName"
+    }
+    
+    // serialize
+    
+    JSON.stringify(persons)
+    
+    '[{"name":"Jimmy","surname":"Dick"},{"name":"Sara","surname":"Conor"},{"name":"Stan","surname":"Jopa"},{"name":"Gregor","surname":"Clit"},{"name:"Billy","surname":"Herington"}]'
+    
+    let jsPersons = JSON.stringify(persons)
+    
+    // deserialize
+    
+    jsPersons ='[{"name":"Jimmy","surname":"Dick"},{"name":"Sara","surname":"Conor"},{"name":"Stan","surname":"Jopa"},{"name":"Gregor","surname":"Clit"},{"name":"Bill","surname":"Didi"}]'
+    let objPersons = JSON.parse(jsPersons)
+    
+    // HTML/ HTML optional fields/ HTML tr color
+    
+    // let a = {
+    //     "name": "Jimmy",
+    //     "surname": "Dick",
+    //     };
+    //     a.sex = "male";
+    //     let b = {
+    //     "name": "Sara",
+    //     "surname":"Conor",
+    //     };
+    //     b.fathername = "Leonidovna"
+    //     let c = {
+    //     "name": "Stan",
+    //     "surname": "Jopa",
+    //     };
+    //     c.age = 18;
+    //     let persons = [a, b, c];
+    //     let d = {
+    //     "name":"Gregor",
+    //     "surname":"Clit",
+    //     "fathername":"Cumguy"
+    //   };
+    //   persons.push(d)
+    
+    let str = "<table border='1'>"
+    str += "<tr><th>persons</th><th>name</th><th>surname</th><th>age</th><th>fathername</th><th>sex</th></tr>"
+    for(let i = 0; i < persons.length; i++){
+        if(i % 2 == 0){
+            str += `<tr style='background: blue'>
+            <td>${i}</td>
+            <td>${persons[i]["name"]}</td>
+            <td>${persons[i]["surname"]}</td>
+            <td>${persons[i]["age"]}</td>
+            <td>${persons[i]["fathername"]}</td>
+            <td>${persons[i]["sex"]}</td></tr>`
+        }
+        else{
+            str += `<tr style='background: yellow'>
+            <td>${i}</td>
+            <td>${persons[i]["name"]}</td>
+            <td>${persons[i]["surname"]}</td>
+            <td>${persons[i]["age"]}</td>
+            <td>${persons[i]["fathername"]}</td>
+            <td>${persons[i]["sex"]}</td></tr>`
+        }
+    
+    str += "</table>"
+    document.write(str)
+    
+ // destruct array
+    
+let arr = [1,2,3,4,5, "a", "b", "c"]
+let [odd1,even1,odd2,even2,odd3,...letters] = arr;
+    
+// destruct string
+    
+let arr1 = [1, "abc"]
+let [number] = arr1
+let [s1,s2,s3] = arr1[1]
+    
+// destruct 2
+    
+let obj = {name: 'Ivan',
+               surname: 'Petrov',
+               children: [{name: 'Maria'}, {name: 'Nikolay'}]}
+    
+let [name1,name2] = obj.children;
+    
+// destruct 3
+    
+let arr2 = [1,2,3,4, 5,6,7,10]
+let [a,b,...length] = arr2