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Is it good practice to create functions which use other functions that you built?
I was wondering if it was good to have this since it makes code less portable.
Thanks
Very good practice.
It is called code reuse and this is what programming is all about.
As for your argument about it making “code less portable”, that only makes sense in a very low level language such as assembly, and even then it makes it more portable as you can isolate platform specific code into functions.
Good code is made of small, understandable functions. Some people say that a function that is longer than 30 lines is too long.