Satrlar bilan ishlash

const matn = "Assalomu alaykum";

console.log("Uzunligi   :", matn.length);
console.log("Birinchi   :", matn[0]);
console.log("Oxirgi     :", matn.at(-1));
console.log("Katta harf :", matn.toUpperCase());
console.log("Kichik harf:", matn.toLowerCase());
console.log("Asl matn   :", matn);

const jumla = "JavaScript - veb dasturlash tili";

console.log("includes   :", jumla.includes("veb"));
console.log("startsWith :", jumla.startsWith("Java"));
console.log("endsWith   :", jumla.endsWith("tili"));
console.log("indexOf    :", jumla.indexOf("veb"));
console.log("indexOf yo'q:", jumla.indexOf("Python"));
console.log("lastIndexOf:", jumla.lastIndexOf("a"));
console.log("search     :", jumla.search(/dastur/));

const matn = "JavaScript";

console.log("slice(0, 4)   :", matn.slice(0, 4));
console.log("slice(4)      :", matn.slice(4));
console.log("slice(-6)     :", matn.slice(-6));
console.log("slice(-6, -3) :", matn.slice(-6, -3));
console.log("substring(0,4):", matn.substring(0, 4));
console.log("substring teskari:", matn.substring(4, 0));
console.log("slice teskari :", matn.slice(4, 0));

const matn = "olma, olma, anor";

console.log("replace    :", matn.replace("olma", "uzum"));
console.log("replaceAll :", matn.replaceAll("olma", "uzum"));
console.log("regex bilan:", matn.replace(/olma/g, "uzum"));
console.log("Asl saqlandi:", matn);

// Bo'shliqlarni tozalash
const kirim = "   Husanboy   ";
console.log("trim      : [" + kirim.trim() + "]");
console.log("trimStart : [" + kirim.trimStart() + "]");
console.log("trimEnd   : [" + kirim.trimEnd() + "]");

const csv = "Husanboy,25,Namangan";
const qismlar = csv.split(",");

console.log("split      :", qismlar);
console.log("Ism        :", qismlar[0]);
console.log("Harflarga  :", "abc".split(""));
console.log("Bo'shliq   :", "bir ikki uch".split(" "));
console.log("Chegara    :", "a,b,c,d".split(",", 2));
console.log("join       :", qismlar.join(" | "));

// Ko'p qatorli matnni qatorlarga
const kop = "birinchi\nikkinchi\nuchinchi";
console.log("Qatorlar   :", kop.split("\n").length, "ta");

console.log("padStart:", "7".padStart(3, "0"));
console.log("padEnd  :", "Ism".padEnd(10, ".") + "qiymat");
console.log("repeat  :", "-".repeat(20));

// Jadval chizish
const qatorlar = [
    ["Mahsulot", "Narx"],
    ["Non", "5000"],
    ["Sut", "12000"]
];

for (const [nom, narx] of qatorlar) {
    console.log(nom.padEnd(12) + narx.padStart(8));
}

// Vaqtni formatlash
const soat = 9;
const daqiqa = 5;
console.log(`${String(soat).padStart(2, "0")}:${String(daqiqa).padStart(2, "0")}`);

const ism = "Malika";
const yosh = 22;

// Ifoda ham yozish mumkin
console.log(`${ism}, ${yosh} yosh, ${yosh >= 18 ? "voyaga yetgan" : "yosh"}`);
console.log(`Kelasi yil: ${yosh + 1}`);

// Ko'p qatorli
const xat = `Hurmatli ${ism},

Sizning arizangiz qabul qilindi.
Rahmat!`;

console.log(xat);

// Ichma-ich shablon
const mahsulotlar = ["olma", "anor"];
console.log(`Ro'yxat: ${mahsulotlar.map((m) => `[${m}]`).join(" ")}`);

const oddiy = "salom";
const emoji = "salom 👋";
const uzbekcha = "o'zbek tili";

console.log("Oddiy uzunlik :", oddiy.length);
console.log("Emoji uzunlik :", emoji.length);
console.log("Emoji belgilar:", [...emoji].length);
console.log("O'zbekcha     :", uzbekcha.length);

// Emoji ni bo'lish xavfli - yarim belgi qoladi
const buzilgan = emoji.slice(0, 7);
const toliqEmoji = [...emoji].at(-1);

console.log("Buzilgan uzunlik:", buzilgan.length, "birlik");
console.log("Emoji butunmi?  :", buzilgan.endsWith(toliqEmoji));
console.log("To'g'ri kesish  :", [...emoji].slice(0, 7).join(""));

const a = "olma";
const b = "Olma";

console.log("=== bilan     :", a === b);
console.log("Kichik harfda :", a.toLowerCase() === b.toLowerCase());
console.log("localeCompare :", a.localeCompare(b, "uz", { sensitivity: "base" }) === 0);

const shaharlar = ["Toshkent", "andijon", "Namangan"];
console.log("Oddiy sort   :", [...shaharlar].sort());
console.log("localeCompare:", [...shaharlar].sort((x, y) =>
    x.localeCompare(y, "uz", { sensitivity: "base" })));

const matn = "Telefon: +998 90 123 45 67, email: [email protected]";

// Raqamlarni topish
console.log("Raqamlar:", matn.match(/\d+/g));

// Email topish
const email = matn.match(/[\w.]+@[\w.]+\.\w+/);
console.log("Email   :", email[0]);

// Tekshirish
const parol = "Kuchli123";
console.log("8+ belgi    :", /.{8,}/.test(parol));
console.log("Raqam bor   :", /\d/.test(parol));
console.log("Katta harf  :", /[A-Z]/.test(parol));

// Tozalash
console.log("Faqat raqam :", "+998 (90) 123-45-67".replace(/\D/g, ""));

const maqola = `JavaScript veb dasturlash tili. JavaScript brauzerda
ishlaydi. Node.js yordamida JavaScript serverda ham ishlaydi.`;

const sozlar = maqola
    .toLowerCase()
    .replace(/[.,]/g, "")
    .split(/\s+/)
    .filter((s) => s.length > 0);

console.log("Jami so'zlar :", sozlar.length);
console.log("Noyob so'zlar:", new Set(sozlar).size);

// Eng ko'p uchraydigan so'zlar
const sanoq = {};
for (const soz of sozlar) {
    sanoq[soz] = (sanoq[soz] ?? 0) + 1;
}

const eng = Object.entries(sanoq)
    .sort((a, b) => b[1] - a[1])
    .slice(0, 3);

console.log("Eng ko'p:");
for (const [soz, soni] of eng) {
    console.log(`  ${soz.padEnd(12)} ${soni} marta`);
}