Array form of lookup is used when you have a small list of values and the values remain constant over time.
A data structure called an array consists of a set of elements (values or variables), each of which is identifiable by an array index or key. Depending on the language, additional data types that describe aggregates of values, like lists and strings, may overlap (or be identified with) array types.
An array is a collection of memory locations, or "boxes," each of which has the same name and can store a single piece of data. An array's data must all be of the same data type. Consider a score table in a game where ten scores must be recorded.
An array is a grouping of identically typed elements that are stored in adjacent memory locations and may each be separately referred to using an index to a special identifier. There is no need to declare five distinct variables when declaring an array of five int values (each with its own identifier).
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