Javascript Basic

primitive data type vs reference data type

primitive data Type

• number
• string
• boolean
• null
• undefined

*reference data type

• all except of primitive data type.

wrapper object but.. what is this? str is string (primitive data)
but it behave like object because primitive data has length method

var str = 'coding';
console.log(str.length);
console.log(str.charAt(0));
//str(primitive data type) behave like object but it will be removed after the use.
//we call this "wrapper object"