variable

variable is a container where storing data .

naming

Limiation

• only letters,digits,symbols,$,_
• first character must not be a digit.
• case sensitive
• camel case (optionalMatter)

let

• let is local variable
• don’t access outside of block
• don’t duplicate accept same block

let name = 'code4mk'
{
  let name = 'kamal';
  console.log(name);
}
console.log(name);

var

• var
• access any where
• last value is current value

var name = 'code4mk'
{
  var name = 'kamal';
  console.log(name);
}
console.log(name);

const

• const always fixed
• no change allow

const price = 51;
// const price = 55 // error
console.log(price);