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 DatatypeWrapper Object
stringString
numberNumber
booleanBoolean
symbolSymbol

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, usetypeof variableName .
// primitive datatypes
      var a = 1; // number
      var b = 'Hello';  // string
      var c = true;  // boolean
      var d; // undefined
      var e = Symbol(54); // symbol
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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 TutorialPrimitive 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.