Union Types is a historical design pattern. In computer science, a union is a value that may have any of several representations or formats within the same position in memory; that consists of a variable that may hold such a data structure. Some programming languages support special data types, called union types, to describe such values and variables. In other words, a union type definition will specify which of a number of permitted primitive types may be stored in its instances, e.g., "float or long integer". Read more on Wikipedia...

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Languages with Union Types include typescript

Example from typescript:

declare type numOrString = string | number

Last updated July 8th, 2019