#javascript_questions

Day-3

What's the output?

let c = { greeting: 'Hey!' };
let d;

d = c;
c.greeting = 'Hello';
console.log(d.greeting);

@apexprogrammer

Explanation for day-3 savol

JavaScriptda barcha objects(obyektlar) bir-biriga tenglashtirilganda reference (havola) orqali o‘zaro ta’sir qiladi.

Yuqoridagi savolda avvaliga variable c objectni saqlaydi, keyinchalik biz d ni c obyektga qanday reference qilsa, xuddi shunday ishora bilan belgilaymiz.

Hullas, d has the same reference that c has to the object.

rasmda ko'rsatilganidek agarda bitta object o'zgarsa hammasi o'zgaradi...

p.s. o'zbekchada tushuntirish bunchalar qiyin 😅

@apexprogrammer

#javascript_questions

Day-4

Kunlik javascript quizchamiz davom etadi...

consolega nima chiqadi?

let a = 3;
let b = new Number(3);
let c = 3;

console.log(a == b);
console.log(a === b);
console.log(b === c);

@apexprogrammer

Day-4 savol explanation

new Number () - bu bult-in funksiya konstruktori. U raqamga o‘xshasa-da, aslida raqam emas: u bir nechta qo‘shimcha xususiyatlarga ega va u object. (u raqam bo'lishi uchun "new" keyword olib tashlanishi kerak edi)

== (Equality operator) operatoridan foydalansak, u faqat uning bir xil qiymatga ega ekanligini tekshiradi. Ularning ikkalasi ham 3 ning qiymatiga ega, shuning uchun u to‘g‘ri keladi.

Ammo === (qat’iy tenglik operatori) operatoridan foydalansak, qiymat ham, type ham bir xil bo‘lishi kerak. Bizning exampleda esa bular teng emas: new Number() - bu raqam emas, bu obyekt. Ikkala javob ham noto‘g‘ri...

thank u...

@apexprogrammer

hello world))

video qo'ymaganimga ham asrlar bo'lib ketti shekilli...

sizlar uchun maxsus YouTubeda vlog: mening bir kunim(technically 3soatim 😅) at Ilmhub.

Youtubeda ko'rishingiz mumkin 👇

https://www.youtube.com/watch?v=FZXyeJDmXks&ab_channel=azizbeknomonjonov

#javascript_questions

Day-5

consolega nima chiqadi?

let greeting;
greetign = {}; // typo (xato) qilindi!
console.log(greetign);

@apexprogrammer

Day-5 Question 6 tushuntirishation:

Nega {} chiqadi? chunki biz global objectda bo‘sh object yaratdik!
greeting so'zini greetign deb noto‘g‘ri yozganimizda, JS interpreter (tarjimoni) buni aslida quyidagicha ko‘rdi:

1. global.greetign = {} (Node.js)
2. window.greetign = {}, `frames.greetign = {} va self.greetign (brauzerlarda )
3. self.greetign (web workers)
4. globalThis.greetign (barcha muhitlarda)

Buning oldini olish uchun "use strict"dan foydalanishimiz mumkin.
Bu o‘zgaruvchini biror narsaga tenglashtirishdan oldin uni e’lon qilganingizga ishonch hosil qiladi.

follow for more))

@apexprogrammer

#monkeytype

Alhamdulillah! monkeytype.com da yangi shaxsiy recordim: 130 (siuuuuu!) 🎉

kimda qanaqa record? 😅

@apexprogrammer

Bu JavaScriptda mumkin, chunki functions are objects! (primitive typelardan tashqari hamma narsa object!)

Funksiya - maxsus object turi. The function is an object with properties. This property is invocable (ya'ni functionni chaqirish mumkin)

@apexprogrammer

#javascript_questions

Day-7

Question - 8

function sum(a, b) {
  return a + b;
}

sum(1, '2');

@apexprogrammer

#javascript_questions

Day-8

Question-9

let number = 0;
console.log(number++);
console.log(++number);
console.log(number);

@apexprogrammer

#misc

who code like this?? 😅

@apexprogrammer