Lists, Matrix and String commands 16 5 NEW

Command Short Description
PUT Replace an item in a composite
PUTI Replace an item and increase index
GET Extract an item from a composite
GETI Extract an item and increase index
HEAD Extract the first item in a composite
TAIL Removes the first item in a composite
OBJ→ Explode an object into its components
REPL Replace elements in a composite
POS Find the position of an element in a composite
NPOS Find object in a composite, starting from index N NEW
POSREV Find the position of an element, starting from the end NEW
NPOSREV Find the position from the end, starting at index N NEW
SUB Extract a group of elements from a composite
SIZE Number of elements in a composite
RHEAD Returns the last element from the composite NEW
RTAIL Removes the last element from the composite NEW