Length( list )
Length returns the length of the list list. The length is defined
as 0 for the empty list, and as the largest positive integer index such
list[index] has an assigned value for nonempty lists. Note
that the length of a list may change if new elements are added to it or
assigned to previously unassigned positions.
gap> Length(  ); 0 gap> Length( [ 2, 3, 5, 7, 11, 13, 17, 19 ] ); 8 gap> Length( [ 1, 2,,, 5 ] ); 5
For lists that contain no holes
Number (see Number), and
Size (see Size) return the same value. For lists with holes
returns the largest index of a bound entry,
Number returns the number
of bound entries, and
Size signals an error.
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