typeand
Typeand is a term used in discussions of type systems to denote the conjunction of two types or type constraints, producing an intersection type. It is not a formal operator in all languages, but in many contexts it is used informally to describe the idea of a value that belongs to both A and B.
In formal terms, if a value x has type A and type B, one can describe its
Languages that support intersection or constraint-based typing provide syntax that resembles typeand. For instance, in TypeScript,
Because the term typeand is informal, its exact syntax and rules vary by language or literature. Some
See also: intersection type, product type, type constraint, type class, dependent type, TypeScript.