Name
boolean( ) — converts another datatype into a boolean
Synopsis
| Defined in: XPath 1.0 |
Parameters: object bool (optional) |
| Return type: boolean |
Other datatypes are converted according to the following rules:
- node-set
An empty node-set produces
false; anything else producestrue.- number
Zero and
NaNproducefalse; anything else producestrue.- string
An empty string produces
false; anything else producestrue.
When called with no parameters, the converted value of the context node is returned.
This example returns true if the Location Path
a/b happens to select one or more nodes;
otherwise, it returns false:
boolean(a/b)
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