list: A sequence of values.
element: One of the values in a list (or other sequence), also called items.
index: An integer value that indicates an element in a list.
nested list: A list that is an element of another list.
list traversal: The sequential accessing of each element in a list.
mapping: A relationship in which each element of one set corresponds to an element of another set. For example, a list is a mapping from indices to elements.
accumulator: A variable used in a loop to add up or accumulate a result.
augmented assignment: A statement that updates the value of a variable using an operator like +=.
reduce: A processing pattern that traverses a sequence and accumulates the elements into a single result.
map: A processing pattern that traverses a sequence and performs an operation on each element.
ﬁlter: A processing pattern that traverses a list and selects the elements that satisfy some criterion.
object: Something a variable can refer to. An object has a type and a value.
equivalent: Having the same value.
identical: Being the same object (which implies equivalence).
reference: The association between a variable and its value.
aliasing: A circumstance where two or more variables refer to the same object.
delimiter: A character or string used to indicate where a string should be split.