How to assign a value to something inside a module globally? [closed]

Question

Let's say I created a function that calculates something inside a module. How do I assign that result to a global value?

Let's say I have this:

function[input_]:=input*5;

findRoot[fun,input]:= module[{iterations=0}, While[iterations<10, result=fun[input]]; 
iterations = iterations + 1; input=input/2;
savetoglobal = result];

How do I save the result to the global environment? (sorry if this example doesn't make sense).

Any help would be greatly appreciated.

Answer 1

How do I save the result to the global environment?

If you assign a value inside a module to a variable which is not defined as local variable in the module, it is automatically put in global space.

ClearAll[x];
x
foo[z_] := Module[{n},
  n = 5;
  x = z + 10; (*update some global variable x *)
  Print["I am done"]
  ];
foo[3];

Now when you examine after the call $x$ it will exist in global space and have value 12.

And it is global

So you do not have to do anything. But it is not good programming practice to do this. Functions should only communicate with the outside world via input and explicit return value. They should not have any other side effects.

You can also notice, if you look closely, from the color of the symbol inside the module, that it is global