Pika
/
homework


			
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							<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // 3 persons
        let a = {
            name: "Andrey",
            surname: "Ivanov",
        }
        let b = {
            name: "Igor",
            surname: "Vasin",
        }
        let c = {
            name: "Oleg",
            surname: "Petrov",
        }


        //different fields
        let a = {
            name: "Andrey",
            surname: "Ivanov",
            fathername: "Andreevich",
            age: 21,
            sex: "male"
        }
        let b = {
            name: "Igor",
            surname: "Vasin",
            fathername: "Igorevich",
            age: 31
        }
        let c = {
            name: "Oleg",
            surname: "Petrov",
            fathername: "Olegovich"
        }

        //fields check
        let a = {
            name: "Andrey",
            surname: "Ivanov",
            fathername: "Andreevich",
            age: 21,
            sex: "male"
        }
        let b = {
            name: "Igor",
            surname: "Vasin",
            fathername: "Igorevich",
            age: 31
        }
        let c = {
            name: "Oleg",
            surname: "Petrov",
            fathername: "Olegovich"
        }
        if ("sex" in a) {
            alert(a.sex)
        } if ("age" in a) {
            alert(a.age)
        } if ("sex" in b) {
            alert(b.sex)
        } if ("age" in b) {
            alert(b.age)
        } if ("sex" in c) {
            alert(c.sex)
        } if ("age" in c) {
            alert(c.age)
        }

        //array of persons
        let arraypersons = [a, b, c, { name: 'Daniil', surname: 'Kovalev', fathername: "Alexandrovich", age: 30 }]


        //loop of persons
        let persons = [
            a = {
                name: "Andrey",
                surname: "Ivanov",
                fathername: "Andreevich",
                age: 21,
                sex: "male"
            },
            b = {
                name: "Igor",
                surname: "Vasin",
                fathername: "Igorevich",
                age: 31
            },
            c = {
                name: "Oleg",
                surname: "Petrov",
                fathername: "Olegovich"
            }

        ]
        for (i = 0; i < persons.length; i++) {
            console.log(persons[i].name + "  " + persons[i].surname)
        }
        //loop of loop of values
        let persons = [
            a = {
                name: "Andrey",
                surname: "Ivanov",
                fathername: "Andreevich",
                age: 21,
                sex: "male"
            },
            b = {
                name: "Igor",
                surname: "Vasin",
                fathername: "Igorevich",
                age: 31
            },
            c = {
                name: "Oleg",
                surname: "Petrov",
                fathername: "Olegovich"
            }

        ]

        for (i = 0; i < persons.length; i++) {
            for (let key in persons[i]) {
                console.log(persons[i][key])
            }

        }

        //fullName
        let persons = [
            a = {
                name: "Andrey",
                surname: "Ivanov",
                fathername: "Andreevich",
                age: 21,
                sex: "male"
            },
            b = {
                name: "Igor",
                surname: "Vasin",
                fathername: "Igorevich",
                age: 31
            },
            c = {
                name: "Oleg",
                surname: "Petrov",
                fathername: "Olegovich"
            }

        ]
        for (let newkey of persons) {
            if (newkey.name && newkey.surname) {
                newkey.fullName = newkey.name + '  ' + newkey.surname;
            }


        } console.log(persons)

        //serialize
        JSON.stringify(persons)
        '[{"name":"Andrey","surname":"Ivanov","fathername":"Andreevich","age":21,"sex":"male"},{"name":"Igor","surname":"Vasin","fathername":"Igorevich","age":31},{"name":"Oleg","surname":"Petrov","fathername":"Olegovich"}]'

        //deserialize
        '{"name":"Anna","surname":"Petrova","fathername":"Igorevna","age":24}'
        let d = '{"name":"Anna","surname":"Petrova","fathername":"Igorevna","age":24}'
        d = JSON.parse('{"name":"Anna","surname":"Petrova","fathername":"Igorevna","age":24}')
        persons[3] = d;
        console.log(persons)

        // HTML
        let persons = [
            a = {
                name: "Andrey",
                surname: "Ivanov",
                fathername: "Andreevich",
                age: 21,
                sex: "male"
            },
            b = {
                name: "Igor",
                surname: "Vasin",
                fathername: "Igorevich",
                age: 31
            },
            c = {
                name: "Oleg",
                surname: "Petrov",
                fathername: "Olegovich"
            },
            d = {
                name: "Anna",
                surname: "Petrova",
                fathername: "Igorevna",
                age: 24
            }
        ]

        let str = "<table border='1' cols = 4>"
        for (let i = 0; i < persons.length; i++) {
            str += `<tr><td>${persons[i].name}</td><td>${persons[i].surname}</td></tr>`
        }
        str += "</table>"

        console.log(str)
        document.write(str)

        //HTML optional fields
        let persons = [
            a = {
                name: "Andrey",
                surname: "Ivanov",
                fathername: "Andreevich",
                age: 21,
                sex: "male"
            },
            b = {
                name: "Igor",
                surname: "Vasin",
                fathername: "Igorevich",
                age: 31
            },
            c = {
                name: "Oleg",
                surname: "Petrov",
                fathername: "Olegovich"
            },
            d = {
                name: "Anna",
                surname: "Petrova",
                fathername: "Igorevna",
                age: 24
            }
        ]
        let str = "<table border='1' cols = 4>"
        for (let i = 0; i < 4; i++) {
            for (let key in persons[i]) {
                str += `<tr><td>${key}</td><td>${persons[i][key]}</td></tr>`

                
            }
        }str += "</table>"
        console.log(str)
        document.write(str)

        //HTML tr color
        let persons = [
            a = {
                name: "Andrey",
                surname: "Ivanov",
                fathername: "Andreevich",
                age: 21,
                sex: "male"
            },
            b = {
                name: "Igor",
                surname: "Vasin",
                fathername: "Igorevich",
                age: 31
            },
            c = {
                name: "Oleg",
                surname: "Petrov",
                fathername: "Olegovich"
            },
            d = {
                name: "Anna",
                surname: "Petrova",
                fathername: "Igorevna",
                age: 24
            }
        ]
        let str = "<table border='1' cols = 4>"
        for (let i = 0; i < 4; i++) {
            for (let key in persons[i]) {
                str += `<tr style = "color: green; ><td>${key}</td><td>${persons[i][key]}</td></tr>`

                
            }
        }str += "</table>"
        console.log(str)
        document.write(str)


        //destruct array
        if (key in a, b, c)
            //destruct array
            let arr = [1, 2, 3, 4, 5, "a", "b", "c"]
        let [odd1, even1, odd2, even2, odd3, ...abc] = arr;
        //destruct string
        let arr = [1, "abc"]
        let [number, ...abc] = arr;
        let [a, b, c] = "abc";
        let [s1, s2, s3] = [a, b, c];
        //destruct 2

        let obj = {
            name: 'Ivan',
            surname: 'Petrov',
            children: [{ name: 'Maria' }, { name: 'Nikolay' }]
        }

        let {
            children:
            [{ name: name1 },
                { name: name2 }
            ] } = obj;


        //destruct 3
        let number = [1, 2, 3, 4, 5, 6, 7, 10];
        let [a, b, { length = number.length }] = number


    </script>
</body>

</html>