The
List.seek function returns the one-based index of the first occurrence in the
List of
value. The type of the value must match the type of the List. If the numeric expression
starting_index is provided, then the function starts searching the for value starting at the index provided. Alternatively, if the @ symbol precedes the numeric expression
nth_occurrence, the function searches for the n
th occurrence of the value.
The function returns the one-based index of the value, if found, and 0 if no such value is in the List.