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Object/Oriented JavaScript

  • Object/Oriented JavaScript
  • Stoyan Stefanov
  • 128字
  • 2021-08-13 19:25:52

Primitive Data Types Recap

Let's quickly summarize what has been discussed so far:

  • There are five primitive data types in JavaScript:
    • number
    • string
    • boolean
    • undefined
    • null
  • Everything that is not a primitive is an object
  • The number data type can store positive and negative integers or floats, hexadecimal numbers, octal numbers, exponents, and the special numbers NaN, Infinity, and –Infinity
  • The string data type contains characters in quotes
  • The only values of the boolean data type are true and false
  • The only value of the null data type is the value null
  • The only value of the undefined data type is the value undefined
  • All values become true when converted to a boolean, with the exception of the six falsy values:
    • ""
    • null
    • undefined
    • 0
    • NaN
    • false
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