position(VisibleList,Function) -- find first element of a list satisfying a condition

position(VisibleList,Function) -- find first element of a list satisfying a condition

Synopsis:

Function: position -- find first element of a list satisfying a condition

Input:

an instance of class VisibleList.

an instance of class Function.

Code:

     -- ../../../Macaulay2/m2/structure.m2:13-19
     position(VisibleList,Function) := (v,f) -> (
          ret := null;
          select(
               1, 
               apply(#v, i -> (i,v#i)), 
               (i,x) -> f(x) and (ret = i; true));
          ret)