Associative array

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What Wikipedia says

In computer science, an associative array, key-value store, map, symbol table, or dictionary is an abstract data type that stores a collection of key/value pairs, such that each possible key appears at most once in the collection. In mathematical terms, an associative array is a function with finite domain.

Excerpt from the Wikipedia article “Associative array”, under the CC BY-SA 4.0 license. Read the article on Wikipedia