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tagged union

data structure used to hold a value that could take on several different, but fixed, types
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tagged union

Summary

tagged union ranks in the top 2% of general entities by monthly Wikipedia readership (855 views/month).[1]

Key Facts

  • tagged union is a type of algebraic data type[2].
  • tagged union's facet of is recorded as type theory[3].

Body

Definition and Type

tagged union is a type of algebraic data type[2].

Why It Matters

tagged union ranks in the top 2% of general entities by monthly Wikipedia readership (855 views/month).[1] It has Wikipedia articles in 7 language editions, a strong signal of global cultural recognition.[4] It is known by 9 alternative names across languages and contexts.[5]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.

Aggregate / graph-position facts

  1. [1] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [4] ↑ . Wikidata sitelinks. wikidata.org.
  3. [5] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). tagged union. Retrieved April 10, 2026, from https://4ort.xyz/entity/tagged-union
MLA “tagged union.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/tagged-union.
BibTeX @misc{4ortxyz_tagged-union_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{tagged union}}, year = {2026}, url = {https://4ort.xyz/entity/tagged-union}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): tagged union — https://4ort.xyz/entity/tagged-union (retrieved 2026-04-10)

Canonical URL: https://4ort.xyz/entity/tagged-union · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 7d ago · YoshiRulz · 2026-07-09 view diff on Wikidata ↗
    Aliases → —
    Glossary entry at wikipedia url → https://abstract.wikipedia.org/wiki/f:Special:MyLanguage/WF:Glossary#sum_type
    Subclass of → —
    Facet of → type theory
    + 1 other property edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ [[Property:P5178]]: https://abstract.wikipedia.org/wiki/f:Special:MyLanguage/WF:Glossary#sum_type"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.