Conditional Statements (if, else if, else)

TypeScript mein conditionals bilkul JavaScript jaise hi hain — if, else if, aur else, curly braces se har block mark hota hai.

main.ts

Khud try karo →

let age: number = 20;
if (age >= 18) {
  console.log("You are an adult");
} else {
  console.log("You are a minor");
}

Output

You are an adult

=== vs. ==, aur ek check jo JavaScript nahi kar sakta

TypeScript JavaScript ke dono equality operators rakhta hai, aur wahi mashwara abhi bhi lagu hota hai: hamesha == ke bajaye === ko tarjeeh do. Lekin TypeScript ka type checker ek aisi cheez add karta hai jo plain JavaScript mein kabhi nahi thi — do values ko compare karna jinke types kabhi barabar ho hi nahi sakte, code chalne se pehle hi ek error ke tor par flag ho jaata hai.

main.ts

Khud try karo →

console.log(5 === 5);
console.log(5 === "5");

Output

script.ts(2,13): error TS2367: This condition will always return 'false' since the types 'number' and 'string' have no overlap.

Yeh waqai woh hai jo TypeScript ka compiler report karta hai — kuch aisa nahi jo plausible dikhne ke liye likha gaya ho. Plain JavaScript mein, 5 === "5" khamoshi se false evaluate ho kar chalta rahega; TypeScript pakar leta hai ke yeh taqreeban zaroor ek ghalati hai aur ise compile karne se hi inkar kar deta hai.

Aage: for loops — collection ke har item par code ko dohrana.

← Generics for Loops →