Union

Set Operations: Union, Intersect, Except

Learn how LINQ's set operators — Union, Intersect, Except, and Distinct — deduplicate and compare sequences using equality semantics.

Discriminated Unions

Learn how F#'s discriminated unions model a closed set of named cases, each optionally carrying data, with compiler-enforced exhaustive pattern matching.

Union and Intersection Types in TypeScript

Combine types with `|` (union) and `&` (intersection) to model values that can be one of several shapes or must satisfy all of them.

Union-Find and Disjoint Sets

A near-constant-time data structure for tracking disjoint sets, essential for cycle detection and Kruskal's MST.

TypeScript Enums Cheat Sheet

Covers numeric and string enums, const enums, reverse mapping, and modern alternatives like literal unions and the as const pattern.