July 2008
Beginner
356 pages
6h 8m
English
Content preview from Object-Oriented JavaScriptBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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
trueandfalse - 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
truewhen converted to a boolean, with the exception of the six falsy values:- ""
nullundefined- 0
NaNfalse
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