JavaScript qanday ishlaydi?

This content originally appeared on DEV Community and was authored by Muhammadqodir

👩‍💻 JavaScript qanday til?

JavaScript — bu interpreted va just-in-time compiled til. Ya’ni, kodni avval butunlay mashina tiliga o‘girib keyin ishga tushirmaydi, balki kerak bo‘lsa tezda tarjima qiladi. Dastlab faqat browserda ishlagan. Hozir Node.js orqali serverda ham ishlaydi.

⚙️ U qanday ishlaydi?

🔴 Kodni o‘qish
Brauzer HTML va CSS bilan birga JS kodini ham yuklab oladi.

🔴 Parsing (tahlil qilish)
JS Engine (masalan, Chrome’da – V8) kodni satrma-satr tahlil qilib, uni AST (Abstract Syntax Tree) ga aylantiradi.

🔴 Compiling (JIT – Just In Time)
Kod AST’dan mashina tiliga tarjima qilinadi. Bu jarayon tezroq ishlashi uchun JIT Compiler qo‘llaniladi.

🔴 Event Loop va Call Stack
JavaScript single-threaded (bitta oqimda ishlaydi).

Call Stack: bajarilishi kerak bo‘lgan funksiyalar navbati.
Event Loop: asinxron ishlarni (setTimeout, fetch va h.k.) navbatga qo‘shib, bo‘sh paytda ularni bajaradi.

🔴 Execution
Natijada, kod ekranda JS Engine orqali bajariladi.

Ko'proq ma'lumot olish

This content originally appeared on DEV Community and was authored by Muhammadqodir

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