Datatypes and variables: Difference between revisions
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(New page: =Data types= Though JavaScript is a [http://en.wikipedia.org/wiki/Weak_typing weakly typed] programming language, there are some data types between which JavaScript sometimes variables aut...) |
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Revision as of 20:28, 14 July 2009
Data types
Though JavaScript is a weakly typed programming language, there are some data types between which JavaScript sometimes variables automatically converts:
null
Null means variable has no value at all. Do not confuse null with 0 (zero)! 0 is just a number, null means just no value or a empty or non-existent reference.
undefined
A value that is undefined is a value held by a variable right after it has been created and before a value has been assigned to it.