Aapka Pehla TypeScript Program

Aap jo bhi TypeScript program likhoge usme console.log() ka use baar baar hoga, bilkul JavaScript ki tarah — yahi hai jisse aapka code aapse baat karta hai. Plain JavaScript se ek cheez alag hai: aapka code run hone se pehle kya hota hai.

Type-checking sabse pehle hoti hai

Jab aap run dabate ho, TypeScript ka compiler aapki poori file padhta hai aur ek bhi line execute karne se pehle har type check karta hai. Agar kahin bhi type error hai, to kuch bhi run nahi hota — aapko output ke bajaye compile error milta hai. Types sahi karo, aur aapka code bilkul waise hi run hoga jaise equivalent JavaScript karta.

Comments

Comments bilkul JavaScript ki tarah kaam karte hain: line mein // ke baad jo bhi likha ho use completely ignore kar diya jaata hai, aur yeh sirf isliye hote hain taaki baad mein code padhne wale insaan samajh sakein ki kuch is tarah kyun likha gaya hai.

Khud run karke dekho

Yeh raha ek chhota program jisme ek comment aur do console.log() calls hain. Neeche dikha output actually execute karke nikala gaya hai — text change karke khud bhi example ke neeche button se run karke dekho.

main.ts

Khud try karo →

// This is a comment - TypeScript ignores it
console.log("Hello, World!");
console.log("Welcome to TypeScript.");

Output

Hello, World!
Welcome to TypeScript.

Aage: basic types — kisi value ka shape describe kaise karein, aur TypeScript actually aapke liye kya pakadta hai.

← TypeScript ka Introduction Basic Types →