Redirecting functions calls ?

[yerl@REDACTED]

Hi All,
Is there a method to redirect the call of a function and execute another one instead.
For exemple, lets assume 2 functions "foo" and "bar":

foo(X) ->
 blablabla,
 26.

bar(Y) ->
 blablabla,
 38.

When calling foo(10), I want to intercept this call and replace with bar(10). Of course, the result of foo(10) is replaced by the one of bar(10).

Can anyboby help me!

Thanks
Yerl