js lec 1 added

lectures/lec5/p1/task1.js

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+alert("Hello, world!");
+document.write("Hello, world!");

lectures/lec5/p1/task2.js

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+let _name = "Алина";
+let email = "alina@test.ru";
+
+let message = `Доброго времени суток, ${_name}! Мы отправили Вам приглашение на почту ${email}.`;
+
+document.write(`<h3>${message}</h3>`);

lectures/lec5/p1/task3.js

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+let p = prompt("Введите значение переменной p:");
+
+if (isNaN(parseFloat(p)) || !isFinite(Number(p))) {
+    alert("Ошибка: введено не число.");
+} else {
+    p = Number(p) + 1;
+    alert(`Увеличенное значение переменной p: ${p}`);
+}

lectures/lec5/p1/task4.js

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+let result = n > 0 ? 1 / n : n < 0 ? 1 / n ** 2 : 0;

lectures/lec5/p1/task5.js

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+let n = 81;
+let i = 1;
+
+let out = "<select>";
+for (let i = 1; i ** 2 <= n; i+=2) {
+    out += `<option>${i**2}</option>`
+}
+out += "</select>";
+
+document.write(out);

lectures/lec5/p1/task6.js

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+function sum() {
+    return arguments.reduce((total, num) => total + num, 0);
+}

lectures/lec5/p1/task7.js

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+sum = function(...args)  {
+    return args.filter(num => num % 2 !== 0).reduce((acc, num) => acc + num, 0);
+}

lectures/lec5/p1/task8.js

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+sum = (...args) => {
+    return args.filter(num => num % 2 !== 0).reduce((acc, num) => acc + num, 0);
+}

lectures/lec5/p2/task1.js

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+function sumNumbers(str){
+    str=str.split(" ");
+    return str.filter(substr => !isNaN(parseFloat(substr)) && isFinite(Number(substr))).reduce((acc,num) => acc+num,0);
+}

lectures/lec5/p2/task2.js

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+function extractText(html){
+    return html.split("<p>").filter(substr => substr.includes("</p>")).map(substr = substr.split("</p>")[0]);
+}

lectures/lec5/p2/task3.js

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+let arr = [12, 17, 12, 67, 23, 67, 8, 8, 9, 12, 8];
+
+let newArr = arr.filter(function (item, index) {
+    return arr.indexOf(item) === index;
+});
+
+alert(newArr);
+//12,17,67,23,8,9

lectures/lec5/p2/task4.js

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+function sortNumbers(str){
+    str=str.split(" ");
+    return str.filter(substr => !isNaN(parseFloat(substr)) && isFinite(Number(substr))).map(Number).sort((a,b) => {return Number(a)-Number(b)});
+}
+
+alert(sortNumbers(" 12 234 67 aboba 123 123 83 27 6"))
+
+

lectures/lec5/p3/task1.js

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+let items = {
+    'ручка': 20,
+    'альбом': "a16",
+    'тетрадь': 10
+};
+
+let entries = Object.entries(items);
+items=Object.fromEntries(entries.filter(entry =>!isNaN(parseFloat(entry[1]) && isFinite(Number(entry[1])))))
+
+console.log(items);

lectures/lec5/p3/task2.js

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+
+function updateObject(oldObject, newObject) {
+    const [newKey, newValue] = Object.entries(newObject)[0];
+    if (newKey in oldObject) {
+        oldObject[newKey] += newValue;
+    } else {
+        oldObject[newKey] = newValue;
+    }
+    return oldObject;
+}
+
+
+const oldObject = { 1: 10, 2: 20, 3: 30 };
+const newObject = { 2: 15 };
+
+const updatedObject = updateObject(oldObject, newObject);
+console.log(updatedObject);

lectures/lec5/p3/task3.js

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+let objGoods = {
+    "ручка": [100, 50.60],
+    "карандаш": [120, 30.00],
+    "тетрадь": [200, 10.50]
+};
+
+outArr = [];
+Object.entries(objGoods).forEach((entry) => {
+    let name = entry[0];
+    entry[1].forEach(price => {
+        outArr.push({ "name": name, amount: price })
+    })
+});
+
+console.log(outArr);

lectures/lec5/p3/task4.js

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+let items = {
+    'ручка': 20,
+    'альбом': 16,
+    'тетрадь': 10
+};
+
+let entries = Object.entries(items);
+entries.sort((a,b) => Number(a[1])-Number(b[1]));
+items=Object.fromEntries(entries)
+
+console.log(items);