When to use Float32Array instead of Array in JavaScript

Question

When does it make sense to use a Float32Array instead of a standard JavaScript Array for browser applications?

This performance test shows

Answer 1

I would assume that the glMatrix library uses Float32Array because it is primarily used in WebGL-applications, where matrices are represented as Float32Arrays (http://www.khronos.org/registry/webgl/specs/1.0/#5.14.10).