JavaScript Primitive Datatypes

Primitive Datatypes are those which are represented directly at the lowest level of language implementation. There are six primitive datatypes in JavaScript. They are :

  • string
  • number
  • boolean
  • null
  • undefined
  • symbol

Primitive data types does not have any methods.

JavaScript provides wrapper objects for the primitive datatypes with methods implemented.

Primitive Datatype Wrapper Object
string String
number Number
boolean Boolean
symbol Symbol

For the primitive datatypes : null, undefined : there are no Wrapper Objects.

Initialize variables with primitive values

JavaScript is a dynamic language.

  • Variables are not declared with a datatype.
  • A variable is not fixed to a single datatype.
  • A variable’s datatype changes with the value assigned to a variable.
  • To know a datatype of value that is stored in a variable, use typeof variableName .
// primitive datatypes
      var a = 1; // number
      var b = 'Hello';  // string
      var c = true;  // boolean
      var d; // undefined
      var e = Symbol(54); // symbol

Try Online

Note: Null datatype has only one value and that is null. In JavaScript a null value represents a reference that points, generally intentionally, to a nonexistent or invalid object or address.

Conclusion

In this JavaScript Tutorial – Primitive Datatypes, we have learnt about the different datatypes available, how to initialize a variable with one of them, and how to know a variable’s value datatype.