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