Collections

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Ref. WGR Chapter 9, Collection and container objects

Array	Hash
ordered list of values	unordered set of key/value pairs
has an index that must be an integer	has a key that can be any object (symbol, number, string, another hash, etc.)
also called List, Vector, Stack(?)	Hash is also called Map, Dictionary
literals are defined with [ ]	literals are defined with { }
accessed with [ ]	also accessed with [ ]