---
title: "lerp | 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 lerp

-   lerp(a: number, b: number, alpha: number): number[](#lerp)
    
    Performs simple linear interpolation between two numbers.
    
    #### Parameters
    
    -   a: number
        
        The start value
        
    -   b: number
        
        The end value
        
    -   alpha: number
        
        The interpolation factor (typically between 0 and 1): 0 returns a, 1 returns b, and values in between return a proportional mix
        
    
    #### Returns number
    
    The interpolated value between a and b