for Loops

For loop code ke ek block ko fixed number of times, ya collection ke har item ke liye ek baar run karta hai. JavaScript mein do tarike jaanna zaroori hai: classic for loop, aur zyada modern for...of.

for (let i = 0; i < 5; i++) {
  console.log(i);
}

0
1
2
3
4

Classic for loop mein semicolons se alag kiye gaye teen parts hote hain: ek starting value (let i = 0), har iteration se pehle check hone wali condition (i < 5), aur har iteration ke baad chalne wali cheez (i++). Yeh poora control deta hai, lekin off-by-one error hona aasan hai.

for...of se array par loop karna

for...of aapko har item seedha de deta hai, bina index manually track kiye — Python ke for loop ke kaam karne ke tarike ke zyada kareeb.

const fruits = ["apple", "banana", "cherry"];
for (const fruit of fruits) {
  console.log(fruit);
}

apple
banana
cherry

Aage: while loops — ek fixed collection ke bajaye ek condition ke basis par repeat karna.