diff --git a/task4/js/script.js b/task4/js/script.js
new file mode 100644
index 0000000..66da76f
--- /dev/null
+++ b/task4/js/script.js
@@ -0,0 +1,341 @@
+(function () {
+    var photoPosts = [
+        {
+            id: '1',
+            description: 'NARUTO best anime',
+            createdAt: new Date('2014-12-12T12:12:12'),
+            author: 'Misha',
+            photoLink: 'img/naruto.png',
+            postVisibility: true,
+            hashTags: ["#NARUTOBESTANIME"],
+            likes: ["Alex"]
+        },
+
+        {
+            id: '2',
+            description: 'AVATAR best anime',
+            createdAt: new Date('2015-12-12T12:12:12'),
+            author: 'Misha',
+            photoLink: 'img/avatar.png',
+            postVisibility: true,
+            hashTags: ["#AVATARBESTANIME"],
+            likes: ["Egor"]
+        }, {
+            id: '3',
+            description: 'SHAMAN-KING best anime',
+            createdAt: new Date('2012-12-12T12:12:12'),
+            author: 'Misha2019',
+            photoLink: 'img/sham.png',
+            postVisibility: true,
+            hashTags: ["#SHAMANKINGBESTANIME"],
+            likes: ["Pomeedorka"]
+        },
+        {
+            id: '4',
+            description: 'NARURO best anime',
+            createdAt: new Date('2013-12-12T12:12:12'),
+            author: 'Misha20',
+            photoLink: 'img/naruto.png',
+            postVisibility: true,
+            hashTags: ["#NARUTOBESTANIME"],
+            likes: ["Jora"]
+        },
+        {
+            id: '5',
+            description: 'AVATAR best anime',
+            createdAt: new Date('2018-12-12T12:12:12'),
+            author: 'Misha',
+            photoLink: 'img/avatar.png',
+            postVisibility: true,
+            hashTags: ["#AVATARBESTANIME"],
+            likes: ["Jaga"]
+        },
+        {
+            id: '6',
+            description: 'SHAMAN-KING best anime',
+            createdAt: new Date('2017-12-12T12:12:12'),
+            author: 'Misha22',
+            photoLink: 'img/sham.png',
+            postVisibility: true,
+            hashTags: ["#SHAMANKINGBESTANIME"],
+            likes: ["Jaguar"]
+        },
+        {
+            id: '7',
+            description: 'NARUTO best anime',
+            createdAt: new Date('2016-12-12T12:12:12'),
+            author: 'Misha23',
+            photoLink: 'img/naruto.png',
+            postVisibility: true,
+            hashTags: ["#NARUTOBESTANIME"],
+            likes: ["Jagorka"]
+        },
+        {
+            id: '8',
+            description: 'AVATAR best anime',
+            createdAt: new Date('2091-12-12T12:12:12'),
+            author: 'Misha',
+            photoLink: 'img/avatar.png',
+            postVisibility: true,
+            hashTags: ["#AVATARBESTANIME"],
+            likes: ["Igor"]
+        },
+        {
+            id: '9',
+            description: 'SHAMAN-KING best anime',
+            createdAt: new Date('2020-12-12T12:12:12'),
+            author: 'Misha',
+            photoLink: 'img/sham.png',
+            postVisibility: true,
+            hashTags: ["#SHAMANKINGBESTANIME"],
+            likes: ["Egr"]
+        },
+
+    ];
+    var postForFilter = {
+        author: 'Misha',
+        hashTags: ["#AVATARBESTANIME"]
+    };
+    console.log("\n\nСортировка и фильтрация постов. id найденных: \n");
+    var sortedArrOfPosts = getPhotoPosts(1, 2, postForFilter);
+    for (var i = 0; i < sortedArrOfPosts.length; i++) {
+        console.log("id: " + sortedArrOfPosts[i].id);
+    }
+    var postOfId = getPhotoPost("5");
+    console.log("Пост по id:  " + postOfId.createdAt);
+    var postForVal = {
+        id: '15',
+        description: 'NARUTO best anime (one more post)',
+        createdAt: new Date('2012-12-12T12:12:12'),
+        author: 'Misha2018',
+        photoLink: 'img/naruto.png',
+        postVisibility: true,
+        hashTags: ["#JUSTNARUTO"],
+        likes: ["Maladec"]
+    };
+    console.log("Проверка поста на валидность: " + validatePhotoPost(postForVal));
+    var newPost = {
+        id: '10',
+        description: 'NARUTO best anime (one more post)',
+        createdAt: new Date('2012-12-12T12:12:12'),
+        author: 'Misha2018',
+        photoLink: 'img/naruto.png',
+        postVisibility: true,
+        hashTags: ["#JUSTNARUTO"],
+        likes: ["Maladec"]
+    };
+    console.log("Добавление нового поста с предварительной проверкой: " + addPhotoPost(newPost));
+    var postForEditing = {
+        description: 'NARUTO best anime (one more Naruto)',
+        createdAt: new Date('2007-12-12T12:12:12')
+    }
+    console.log("Изменение поста по id: " + editPhotoPost("1", postForEditing));
+
+    for (var i = 0; i < photoPosts.length; i++) {
+        if (photoPosts[i].postVisibility) {
+            console.log("id: " + photoPosts[i].id + "\n");
+            console.log("description: " + photoPosts[i].description + "\n");
+            console.log("createdAt: " + photoPosts[i].createdAt + "\n");
+            console.log("author: " + photoPosts[i].author + "\n");
+            console.log("photoLink: " + photoPosts[i].photoLink + "\n");
+            console.log("hashTags:\n");
+            for (var j = 0; j < photoPosts[i].hashTags.length; j++) {
+                console.log("           " + photoPosts[i].hashTags[j] + "\n");
+            }
+            console.log("likes:\n");
+            for (var j = 0; j < photoPosts[i].likes.length; j++) {
+                console.log("           " + photoPosts[i].likes[j] + "\n");
+            }
+            console.log("\n");
+        }
+    }
+    console.log("--------------------------------\n\n");
+    console.log("Удаление поста по id: " + removePhotoPost("5"));
+
+    for (var i = 0; i < photoPosts.length; i++) {
+        if (photoPosts[i].postVisibility) {
+            console.log("id: " + photoPosts[i].id + "\n");
+            console.log("description: " + photoPosts[i].description + "\n");
+            console.log("createdAt: " + photoPosts[i].createdAt + "\n");
+            console.log("author: " + photoPosts[i].author + "\n");
+            console.log("photoLink: " + photoPosts[i].photoLink + "\n");
+            console.log("hashTags:\n");
+            for (var j = 0; j < photoPosts[i].hashTags.length; j++) {
+                console.log("           " + photoPosts[i].hashTags[j] + "\n");
+            }
+            console.log("likes:\n");
+            for (var j = 0; j < photoPosts[i].likes.length; j++) {
+                console.log("           " + photoPosts[i].likes[j] + "\n");
+            }
+            console.log("\n");
+        }
+    }
+
+    function getPhotoPosts(postStart, number, filterConfig) {
+        if (postStart + number > photoPosts.length || postStart < 0) {
+            console.log("Нельзя вывести столько постов. Промежуток вывода не совпадает с количеством постов");
+            return null;
+        }
+        else {
+            var sortedArrOfPosts = photoPosts;
+            if (filterConfig.author) {
+                sortedArrOfPosts = sortedArrOfPosts.filter(function (post) {
+                    return post.author === filterConfig.author;
+                });
+            }
+            if (filterConfig.createdAt) {
+                sortedArrOfPosts = sortedArrOfPosts.filter(function (post) {
+                    return post.createdAt === filterConfig.createdAt;
+                });
+            }
+            if (filterConfig.hashTags) {
+                sortedArrOfPosts = sortedArrOfPosts.filter(function (post) {
+                    for (let hashTagsOfPost of post.hashTags) {
+                        for (let hashTagsOfFilter of [].concat(filterConfig.hashTags)) {
+                            if (hashTagsOfPost === hashTagsOfFilter) {
+                                return true;
+                            }
+                        }
+                    }
+                });
+            }
+            sortedArrOfPosts = sortedArrOfPosts.sort(dateComparator).slice(postStart, number + postStart);
+
+            return sortedArrOfPosts;
+        }
+    }
+
+    function dateComparator(post1, post2) {
+        return post1.createdAt - post2.createdAt;
+    }
+
+    function getPhotoPost(idOfPost) {
+        return photoPosts.find(function findPost(post) {
+            return post.id === idOfPost;
+        });
+    }
+
+    function validatePhotoPost(postForCheck) {
+        if (typeof postForCheck.id !== "string" || postForCheck.id === "") {
+            console.log("Пустое поле id");
+            return false;
+        }
+
+        if (photoPosts.some(function checkUniqueness(post) {
+                return postForCheck.id === post.id;
+            })) {
+            console.log("id не уникальный");
+            return false;
+        }
+
+        if (typeof postForCheck.description !== "string" || postForCheck.description.length > 200 || postForCheck.description === "") {
+            console.log("Неверный description");
+            return false;
+        }
+        if (typeof postForCheck.author !== "string" || postForCheck.author === "") {
+            console.log("Поле author пустое");
+            return false;
+        }
+        if (!(postForCheck.createdAt instanceof Date) || ((postForCheck.createdAt).toString() === 'Invalid Date')) {
+            console.log("Поле даты создания не введено, либо имеет неправильную структуру");
+            return false;
+        }
+        if (typeof postForCheck.photoLink !== "string" || postForCheck.photoLink === "") {
+            console.log("Поле photoLink пустое");
+            return false;
+        }
+        if (!(postForCheck.hashTags instanceof Array)) {
+            console.log("Структура поля hashTags не верна");
+            return false;
+        }
+        return true;
+    }
+
+    function validateForEditing(postForCheck) {
+        if (typeof postForCheck.description !== "string" || postForCheck.description.length > 200 || postForCheck.description === "") {
+            console.log("Неверный description");
+
+            return false;
+        }
+        if (typeof postForCheck.author !== "string" || postForCheck.author === "") {
+            console.log("Поле author пустое");
+            return false;
+        }
+        if (!(postForCheck.createdAt instanceof Date) || ((postForCheck.createdAt).toString() === 'Invalid Date')) {
+            console.log("Поле даты создания не введено, либо имеет неправильную структуру");
+            return false;
+        }
+        if (typeof postForCheck.photoLink !== "string" || postForCheck.photoLink === "") {
+            console.log("Поле photoLink пустое");
+            return false;
+        }
+        if (!(postForCheck.hashTags instanceof Array)) {
+            console.log("Структура поля hashTags не верна");
+            return false;
+        }
+        return true;
+    }
+
+    function addPhotoPost(newPost) {
+        if (!validatePhotoPost(newPost)) {
+            return false;
+        }
+        else {
+            photoPosts.push(newPost);
+            return true;
+        }
+    }
+
+    function editPhotoPost(idForEd, postForEd) {
+        var postOfId = getPhotoPost(idForEd);
+        if (!postOfId) {
+            return false;
+        }
+        var postCopy = JSON.parse(JSON.stringify(postOfId));
+        if (postForEd.description != null) {
+            postCopy.description = postForEd.description;
+        }
+        if (postForEd.author != null) {
+            postCopy.author = postForEd.author;
+        }
+        if (postForEd.createdAt != null) {
+            postCopy.createdAt = postForEd.createdAt;
+        }
+        if (postForEd.photoLink != null) {
+            postCopy.photoLink = postForEd.photoLink;
+        }
+        if (postForEd.hashTags != null) {
+            postCopy.hashTags = postForEd.hashTags;
+        }
+
+        if (validateForEditing(postCopy)) {
+            changePostData(postOfId, postCopy);
+            return true;
+        }
+        return false;
+    }
+
+    function changePostData(post1, post2) {
+        post1.description = post2.description;
+
+        post1.author = post2.author;
+
+        post1.createdAt = post2.createdAt;
+
+        post1.photoLink = post2.photoLink;
+
+        post1.hashTags = post2.hashTags;
+    }
+
+    function removePhotoPost(idForRem) {
+        var postOfId = getPhotoPost(idForRem);
+        if (postOfId == null) {
+            console.log("Пост для удаления не найден");
+            return false;
+        }
+        else {
+            postOfId.postVisibility = false;
+            return true;
+        }
+    }
+}());