Aapka Pehla TypeScript Program

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

Type-checking sab se pehle hoti hai

Jab aap run dabate hain, TypeScript ka compiler aapki poori file parhta hai aur ek bhi line chalane se pehle har type check karta hai. Agar kahin bhi type error hai, to kuch bhi nahi chalta — aapko output ke bajaye compile error milta hai. Types theek karo, aur aapka code bilkul waise hi chalega jaise equivalent JavaScript chalta.

Comments

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

Khud chala kar dekho

Yeh raha ek chhota program jisme ek comment aur do console.log() calls hain. Neeche dikhaya gaya output waqai execute kar ke nikala gaya hai — text badal kar khud bhi example ke neeche button se chala kar 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 asal mein aapke liye kya pakarta hai.

← TypeScript Ka Taaruf Basic Types →