02. Variables & Data Types
Naam dekar value rakhna — let, const, string, number, boolean.
Is chapter me cover hoga:
- Variable kya hai?
- let vs const
- string, number, boolean
- typeof
1. Variable = dibba jiska naam hai
Kitchen me masale ke dibbe socho — namak, haldi. Har dibbe ka naam hai, andar value hai.
JS me:
let age = 18;
Yahan age naam hai, 18 value hai.
Baad me age likhne se 18 mil jayega.
2. let aur const
• let — value badal sakte ho
• const — ek baar set, phir change nahi (constant)
Beginners: zyada tar let se start karo. Jo cheez kabhi nahi badlegi (jaise site ka naam) uske liye const.
3. Data types (simple)
• String — text: "hello" ya 'hello'
• Number — 10, 3.14
• Boolean — sirf true ya false (haan/na)
typeof se puchh sakte ho: ye kis type ki value hai?
Practice — variables
Apna naam aur age variables me rakho, console me print karo.