VadymShakhmatenko
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homework


			
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//ES6 done hw7

//sort
            var persons = [
                    {name: "Иван", age: 17},
                    {name: "Мария", age: 35},
                    {name: "Алексей", age: 73},
                    {name: "Яков", age: 12},
            ]

            function sort(array, keys, boolean){
                    array.sort(sorting)   
                function sorting(a, b){
                            return (boolean) ? (a[keys] < b[keys]) : (b[keys] < a[keys]);
            }
                return array;
            }

            console.log(sort(persons, "age"));
            // console.log(sort(persons, "name", false));
            // console.log(sort(persons, "age",true));


//array map
            var array = ["1", {}, null, undefined, "500", 700]
            var result  = array.map(function(item) {
                var number = parseInt(item);
                return isNaN(number)? item : number;
            });

            console.log(result);
//array reduce
            var arr = ["0", 5, 3, "string", null]
            function reducing(total, i){
                if (!isNaN(i) && i != 0  && isFinite(i) && i != null){
                return total*=i
                }
                return total;
            };
            var result2 = arr.reduce(reducing, 1)

            console.log( result2 )

//object filter 
        var phone = {
                brand: "meizu",
                model: "m2",
                ram: 2,
                color: "black",
        };

 console.log(filter(phone,(key,value) => key == "color" || value == 2));

 
        function filter(object ,key , value){
            var result = {};
            for(var key in object){
                for(var value in object){
                    if(object[key] == 2) result[key] = object[key];
                    if(value == "color") result[value] = object[value];
                }
            }
            return result;
        }


//object map 
               map({name: "Иван", age: 17},function(key,value){
                var result = {};
                result[key+"_"] = value + "$";                                             
                return result;                                   
            }) 
            //должен вернуть {name_: "Иван$", age_:"17$"}                                   
            function map(object, funct){                                   
                for(key in object){
                funct(object, key, object[key]);
                    delete object[key];
            }
                return object;
            }

            function check(object, key, value){
                object[key + "_"] = value + "$";
                return object;
            }

            console.log(map({name: "Иван", age: 17}, check)) 


//Рекурсия +++++++++++
        function recurse(min , step , max){
            if (max <= 0) return 0;
            return min + recurse(min + step, step ,max -1)
        }

        console.log(recurse(5,10,15) + " = Сумма арифметической прогрессии Sn")


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