---
type: "fhir-fhirpath-function"
title: "FHIR FHIRPath Function: hasValue"
source: "source/fhirpath.html"
---

# FHIR FHIRPath Function: hasValue

This page is part of **FHIR FHIRPath** (FHIR-specific extensions). Base spec lives at [FHIRPath](/fhirpath).

`hasValue() : Boolean`

If the input collection contains a single value which is a FHIR primitive, then will return true if the single value is a primitive value (e.g., as opposed to not having a value and just having extensions) and false if not. If the input collection isn't a single FHIR primitive, the return value is empty.

> **Note to implementers**: The FHIR conceptual model talks about "primitives" as subclasses of the type Element that also have id and extensions. What this actually means is that a FHIR primitive is not a primitive in an implementation language. The introduction (section 2 above) describes the navigation tree as if the FHIR model applies - primitives are both primitives and elements with children.
> 
> In FHIRPath, this means that FHIR primitives have a `value` child, but, as described above, they are automatically cast to FHIRPath primitives when comparisons are made, and that the primitive value will be included in the set returned by `children()` or `descendants()`.

Patient.active.hasValue()

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