---
title: "PossiblyEvaluatedPropertyValue | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Class PossiblyEvaluatedPropertyValue<T>

#### Type Parameters

-   T

##### Index

### Constructors[](#constructors)

[constructor](#constructor)

### Properties[](#properties)

[parameters](#parameters) [property](#property) [value](#value)

### Methods[](#methods)

[constantOr](#constantor) [evaluate](#evaluate) [isConstant](#isconstant)

## Constructors[](#constructors-1)

### constructor[](#constructor)

-   new PossiblyEvaluatedPropertyValue<[T](#constructorpossiblyevaluatedpropertyvaluet)\>(  
        property: [DataDrivenProperty](https://docs.maptiler.com/sdk-js/api-reference/classes/Externals.DataDrivenProperty/)<[T](#t)\>,  
        value: [PossiblyEvaluatedValue](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.PossiblyEvaluatedValue/)<[T](#t)\>,  
        parameters: [EvaluationParameters](https://docs.maptiler.com/sdk-js/api-reference/classes/Externals.EvaluationParameters/),  
    ): PossiblyEvaluatedPropertyValue<[T](#t)\>[](#constructorpossiblyevaluatedpropertyvalue)
    
    #### Type Parameters
    
    -   T
    
    #### Parameters
    
    -   property: [DataDrivenProperty](https://docs.maptiler.com/sdk-js/api-reference/classes/Externals.DataDrivenProperty/)<[T](#t)\>
    -   value: [PossiblyEvaluatedValue](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.PossiblyEvaluatedValue/)<[T](#t)\>
    -   parameters: [EvaluationParameters](https://docs.maptiler.com/sdk-js/api-reference/classes/Externals.EvaluationParameters/)
    
    #### Returns PossiblyEvaluatedPropertyValue<[T](#t)\>
    

## Properties[](#properties-1)

### parameters[](#parameters)

parameters: [EvaluationParameters](https://docs.maptiler.com/sdk-js/api-reference/classes/Externals.EvaluationParameters/)

### property[](#property)

property: [DataDrivenProperty](https://docs.maptiler.com/sdk-js/api-reference/classes/Externals.DataDrivenProperty/)<[T](#t)\>

### value[](#value)

value: [PossiblyEvaluatedValue](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.PossiblyEvaluatedValue/)<[T](#t)\>

## Methods[](#methods-1)

### constantOr[](#constantor)

-   constantOr(value: [T](#t)): [T](#t)[](#constantor-1)
    
    #### Parameters
    
    -   value: [T](#t)
    
    #### Returns [T](#t)
    

### evaluate[](#evaluate)

-   evaluate(  
        feature: [Feature](https://docs.maptiler.com/sdk-js/api-reference/types/Feature/),  
        featureState: [FeatureState](https://docs.maptiler.com/sdk-js/api-reference/types/FeatureState/),  
        canonical?: [CanonicalTileID](https://docs.maptiler.com/sdk-js/api-reference/classes/Externals.CanonicalTileID/),  
        availableImages?: string\[\],  
    ): [T](#t)[](#evaluate-1)
    
    #### Parameters
    
    -   feature: [Feature](https://docs.maptiler.com/sdk-js/api-reference/types/Feature/)
    -   featureState: [FeatureState](https://docs.maptiler.com/sdk-js/api-reference/types/FeatureState/)
    -   `Optional`canonical: [CanonicalTileID](https://docs.maptiler.com/sdk-js/api-reference/classes/Externals.CanonicalTileID/)
    -   `Optional`availableImages: string\[\]
    
    #### Returns [T](#t)
    

### isConstant[](#isconstant)

-   isConstant(): boolean[](#isconstant-1)
    
    #### Returns boolean