---
title: "distance | 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.

# Function distance

-   distance(a: [ReadonlyVec4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyVec4/), b: [ReadonlyVec4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyVec4/)): number[](#distance)
    
    Calculates the euclidian distance between two vec4's
    
    #### Parameters
    
    -   a: [ReadonlyVec4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyVec4/)
        
        the first operand
        
    -   b: [ReadonlyVec4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyVec4/)
        
        the second operand
        
    
    #### Returns number
    
    distance between a and b