Data Type

Data Type

All of data in JavaScript has a type. The data type is also stored in memory in binary. Data is largely divided into primitive types and object types.

• Primitive data type

  • Boolean

    • => Logical True or False

  • Null

    • => Deliberately specifying that there is no value

  • Undefined

    • => A value that is implicitly assigned to a variable that has been declared but has not been assigned a value

  • Number

    • => integer

  • String

    • => " # " text format

  • Symbol (ES6)

    • => Used to create a property key on the only object that has no risk of name collision

• Object/reference type

  • Object

    • Function

    • Arrays

    • Object

Check Data Type

typeof <value>

1. Value

It is an expression that can not be evaluated anymore. An expression is a statement that generates a value. That is, the expression is evaluated to produce a value.

Expressions are represented by the JavaScript engine to produce a single value. Which is mean The value can be assigned to a variable.

Value Assignment

Value is assigned from the right side to the left side through the operator.

2. Number

3. String

3.1 Template Literal

4. Boolean

5. Undefined

6. null

7. symbol

8. Object Type

9. Dynamic Type / Static Type