done

01/app.js

@@ -1 +1,8 @@
-console.log('DOM');
+console.log("DOM");
+const elCommentsItem = document.querySelector(
+  ".comments__item.comments__item--newest"
+);
+if (elCommentsItem) {
+  const dataInfoElements = elCommentsItem.querySelectorAll("[data-info]");
+  console.log(`There are ${dataInfoElements.length} emelents.`);
+}

02/app.js

@@ -1 +1,12 @@
-console.log('DOM');
+console.log("DOM");
+
+const dataUrlList = document.querySelectorAll("a");
+if (dataUrlList) {
+  const dataUrlArr = Array.from(dataUrlList);
+  dataUrlArr.forEach((el) => {
+    if (el.dataset.url) {
+      const url = el.dataset.url;
+      el.setAttribute("href", url);
+    }
+  });
+}

03/app.js

@@ -1,14 +1,27 @@
-console.log('DOM');
+console.log("DOM");
 
 const buttonSettings = {
-    attr: {
-        className: 'btn',
-        title: 'super button'
-    },
-    css: {
-        border: '1px solid #336699',
-        padding: '5px 20px',
-        color: '#444'
-    },
-    text: 'Click me!',
-}
+  attr: {
+    className: "btn",
+    title: "super button",
+  },
+  css: {
+    border: "1px solid #336699",
+    padding: "5px 20px",
+    color: "#444",
+  },
+  text: "Click me!",
+};
+
+const parentSectionBtn = document.querySelector(".parent-for-button");
+const button = document.createElement("button");
+
+for (key in buttonSettings.attr) {
+  button.setAttribute(key, buttonSettings.attr[key]);
+}
+for (key in buttonSettings.css) {
+  button.style[key] = buttonSettings.css[key];
+}
+button.innerText = buttonSettings.text;
+
+parentSectionBtn.appendChild(button);

04/app.js

@@ -1,8 +1,21 @@
-console.log('DOM');
+console.log("DOM");
 
 // struktura do wykorzystania w pętli
 const menuItems = [
-    {text: 'start', url: '/'},
-    {text: 'galeria', url: '/gallery'},
-    {text: 'kontakt', url: '/contact'},
-];
+  { text: "start", url: "/" },
+  { text: "galeria", url: "/gallery" },
+  { text: "kontakt", url: "/contact" },
+];
+
+const navSection = document.querySelector("nav");
+const unorderdList = document.createElement("ul");
+navSection.appendChild(unorderdList);
+
+for (let i = 0; i < menuItems.length; i++) {
+  const listItem = document.createElement("li");
+  const ancherTag = document.createElement("a");
+  listItem.appendChild(ancherTag);
+  ancherTag.href = menuItems[i].url;
+  ancherTag.innerText = menuItems[i].text;
+  unorderdList.appendChild(listItem);
+}

05/app.js

@@ -1,3 +1,67 @@
-console.log('DOM');
+console.log("DOM");
 
-const curr = document.querySelector('.js-curr');
+const curr = document.querySelector(".js-curr");
+// 1.
+const deletBtn = document.createElement("button");
+deletBtn.innerText = "usuń z koszyka";
+curr.parentElement.appendChild(deletBtn);
+// 2.
+const childArr = [...curr.parentElement.children];
+childArr.forEach((element) => {
+  if (element) {
+    element.classList.add("siblings");
+  }
+});
+// 3.
+curr.parentElement.nextElementSibling.setAttribute(
+  "title",
+  "nextElementSibling"
+);
+// 4.
+const lastArticle = curr.parentElement.parentElement.lastElementChild;
+console.log(lastArticle);
+const lastArticleBtn = lastArticle.querySelector("button");
+const newP = document.createElement("p");
+newP.innerText = "---> New text was added with JavaScript right here <---";
+lastArticle.insertBefore(newP, lastArticleBtn);
+
+// 5.
+
+const articleData = {
+  article: {
+    element: "article",
+    classList: ["articles__item", "article"],
+    text: "",
+  },
+  header: {
+    element: "h1",
+    classList: ["article__title"],
+    text: "JS - Fist Article",
+  },
+  paragrph: {
+    element: "p",
+    classList: ["article__description"],
+    text: "JS - Lorem ipsum dolor sit amet consectetur adipisicing elit. Consequatur quo quibusdam, nemo neque consequuntur pariatur totam? Facere quaerat molestias hic.",
+  },
+  button: {
+    element: "button",
+    classList: ["article__btn"],
+    text: "JS - Kupuję!",
+  },
+};
+
+const sectionArticles = curr.parentElement.parentElement;
+const newArticle = createElement(articleData.article);
+sectionArticles.insertBefore(newArticle, sectionArticles.firstChild);
+newArticle.appendChild(createElement(articleData.header));
+newArticle.appendChild(createElement(articleData.paragrph));
+newArticle.appendChild(createElement(articleData.button));
+
+function createElement(obj) {
+  const element = document.createElement(obj.element);
+  for (classElement in obj.classList) {
+    element.classList.add(classElement);
+  }
+  element.innerText = obj.text;
+  return element;
+}