---
title: "multiply | 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 multiply

-   multiply(out: [vec4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec4/), 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/)): [vec4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec4/)[](#multiply)
    
    Multiplies two vec4's
    
    #### Parameters
    
    -   out: [vec4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec4/)
        
        the receiving vector
        
    -   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 [vec4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec4/)
    
    out