Forum Discussion
Lazy evaluation
Hi Dicken
List.Transform operates on empty list {}, so transformation function (x) => x{0} is never executed resulting empty list.alist{0} directly attempts to access first element of an empty list which immediately raises an index out of range error
alist = {{}} contains one element (an empty list). List.Transform execute once passing {} as x and x{0} fails because inner list is empty, so tr becomes an error. alist{0} returns first element of the outer list which is the empty list {}, so no error
Hi Dicken
List.Transform operates on empty list {}, so transformation function (x) => x{0} is never executed resulting empty list.alist{0} directly attempts to access first element of an empty list which immediately raises an index out of range error
alist = {{}} contains one element (an empty list). List.Transform execute once passing {} as x and x{0} fails because inner list is empty, so tr becomes an error. alist{0} returns first element of the outer list which is the empty list {}, so no error