Valisher Botirov | Development

Immediately invoked function expressions (IIFE) JavaScriptda kod ishga tushgan vaqti e'lon qilingan joyida ishlaydigan fungsiyalarga Immediately invoked function deyiladi. Example: (function(){ console.log("Hello world!") })() //Hello world! ((a,b)=>{ console.log(a + b) })(3,2) //5 #javascript#interview_questions ☑️@valisherbotirov

function func1(){ setTimeout(()=>{ console.log(x); console.log(y); },3000); var x = 2; let y = 12; } func1(); kod natijani nima bo'ladi? #javascript#interview_questions 👉@ummat_uchun_dasturlash

Asinxron JavaScript (2-qism) || Async / await Promiseda ketma-ket .then() methodini ko'p ishlatishdan saqlanish uchun Async/ await dan foydalanish tavsiya qilinadi. async function fetchData(){ const response = await fetch("https://jsonplaceholder.typicode.com/todos/1") const res = await response.json() console.log(res); } Async / await da xatoliklar bilan ishlash uchun try / catch dan foydalanamiz async function fetchData(){ try{ const response = await fetch("https://jsonplaceholder.typicode.com/todos/1") const res = await response.json() if(!res.ok){ throw new Error("show erorr") } console.log(res); } catch(err){ console.log(err); } } Async kalit so'zi bilan boshlangan har qanday fungsiya bizga promise qaytarishini xisobga olsak xatoliklar bilan fungsiya chaqirilgan joyda ham ishlash mumkin. async function fetchData(){ const response = await fetch("https://jsonplaceholder.typicode.com/todos/1") const res = await response.json() if(!res.ok){ throw new Error("show erorr") } return res } fetchData().then((data)=>{ console.log(data) }).catch((err)=>{ console.log(err); }); #javascript#docs ☑️@valisherbotirov

Asinxron JavaScript || Promise JavaScriptda Promiseni new Promise() konstruktoriga argument sifatida o'zida resolve va reject argumentlarini qabul qilgan fungsiya berish bilan yaratamiz. const myPromise = new Promise((resolve, reject) => { let age = 21; setTimeout(() =>{ if(age > 20) resolve("Done processing") else reject("Error processing") },2000) }) Promisedan qaytgan malumotlarni then va catch methodlari bilan tutib olib qayta ishlaymiz myPromise.then((res) =>{ console.log(res) }).catch((err) =>{ console.log(err) }) Agar promise fulfilled muvaffaqiyatli bo'lsa malumotlarni then methodi bilan, agar xatolik rejected bo'lsa unda catch methodida xatolikni tutib olishimiz mumkin! #javascript#docs ☑️@valisherbotirov

// 1. indexOf() -> str.indexOf("m") -> m ni turgan urnini kursatadi // 2. lastIndexOf() -> str.lastIndexOf("y") -> y ni turgan urinini kursatadi. (Oxirigisini kursatadi) // 3. startsWith() -> str.startsWith("al") -> agar mani suzim "alleykum" bulsa true qaytaradi, chunki suzimiz "al" bilan boshlangan // 4. endsWith() -> str.endsWith("lom") -> Agar mani suzim "Salom" bulsa oxiridagi harflarni lom bilan tekshirib kuradi, va shunga qarab true, false qaytaradi // 5. slice()-> str.slice($start, $end) -> str.slice(1, 4); // 6. substring() -> str.substring($start, $end) -> str.substring(1, 5); str.subString(4, 2); JavaScriptda string metodlari | 1-qism #javascript#frontend 👉@ummat_uchun_dasturlash

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