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# XPathResult interface Represents the result of an XPath expression. This interface is used for the parameters passed into custom functions used in [function resolvers](function resolvers.md) and can represent a number, a string, a boolean value, or a node set. ## Methods ```js booleanValue() -> boolean ``` Returns the boolean value of the result in accordance with the XPath 1.0 spec. ```js numberValue() -> number ``` Returns the numeric value of the result in accordance with the XPath 1.0 spec. ```js stringValue() -> string ``` Returns the string value of the result in accordance with the XPath 1.0 spec. ## Methods and properties that are only present on `XPathResult`s representing node sets ```js toArray() -> Array of nodes ``` Returns an array of the nodes in the node set, in document order. ```js first() -> Node ``` Returns the first node in the node set, in document order. ```js size -> number ``` Returns the number of nodes in this node set