July 2013
Intermediate to advanced
382 pages
6h 56m
English
Content preview from Object-Oriented JavaScript - Second EditionBecome 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
Any value that you use is of a certain type. In JavaScript, there are just a few primitive data types:
- Number: This includes floating point numbers as well as integers. For example, these values are all numbers:
1,100,3.14. - String: These consist of any number of characters, for example
"a","one", and"one 2 three". - Boolean: This can be either
trueorfalse. - Undefined: When you try to access a variable that doesn't exist, you get the special value
undefined. The same happens when you declare a variable without assigning a value to it yet. JavaScript initializes the variable behind the scenes with the valueundefined. The undefined data type can only have one value – the special valueundefined. - Null: This is another special data ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.