如何让相同的函数在不同的数组中工作?

What I want is to execute a function when I want to push the positions of vertices of a 3D geometry to an array. I want to use the same code all over again when I want to push positions to an array. Is it even possible to use a function when I want to push something in an array? Can somebody help me please? What I want is to execute a function when I wan