loading and accessing functions from computer memory

Is it possible to load a set of functions directly to the computer memory and call them instead of reading these functions from .m files stored in working folder?

To explain more, assume a script creates a function to be used by fsolve. Instead of creating the function as an m file, can this script store the function directly into memory?

Answer 1

[Walter Roberson]

Anonymous functions are stored in memory, not in .m files. However, anonymous functions must be single expressions and so cannot contain any of the control structures such as for or if or while or switch; also doing assignment inside of anonymous functions is ugly.

[S H]

Ok got it. So it is better I do not pursue this idea for now as there is no practical way to do it.