Name
boolean — Converts its argument to boolean
Synopsis
boolean
boolean
(
|
obj
any
); |
Description
The function converts its argument to a boolean as follows:
-
A number is true if and only if it is neither zero nor NaN.
-
A node-set is true if and only if it is non-empty.
-
A string is true if and only if its length is non-zero.
-
An object of a type other than the four basic types is converted to a boolean in a way that is dependent on that type.
Parameters
obj
The object to be converted into boolean.
Return Types
Boolean
Examples
Example 24.566.
The following expressions are true:
boolean('aaa') = true()
boolean('false') = true()
boolean(false()) = false()
boolean(.) = true()
boolean('0') = true()
boolean(0) = false()