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 advice abhi bhi apply hoti hai: hamesha == ke bajaye === ko prefer karo. 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 equal ho hi nahi sakte, code run hone se pehle hi ek error ke roop mein 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 genuinely 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" chup chaap false evaluate ho kar chalta rahega; TypeScript pakad leta hai ki yeh almost certainly ek mistake hai aur ise compile karne se hi mana kar deta hai.

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

← Generics for Loops →