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By redjamjar
via whiley.org
Published: Jul 31 2013 / 19:06

The Whiley programming language uses union types as a way of combining types together. For example, a variable of type null|int can hold any valid int or null. This provides (amongst other things) an elegant solution to the problem of null references.
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kushti replied ago:

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In data types algebra, union type is about "+" operation, while structure(or class) definition is about "*"

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