oneoftwo

Oneoftwo is a term used in discussions of choice and selection to denote the act or result of selecting one item from a two-element set. It is used as a generic descriptor rather than as a reference to a specific object.

In mathematics and logic, a two-element set {a, b} represents a one-of-two choice; in boolean algebra it corresponds to the values true and false. In type theory this is modeled as a sum type with two constructors, often described as a one-of-two selection between the two possibilities.

In computing, oneoftwo appears in programming patterns as a simple selector that yields one of two values based on a condition, a predicate, or randomness. The concept underlies branching constructs, case analysis, and discriminated unions.

In probability, a fair one-of-two scenario assigns equal likelihood to each option, equivalent to a Bernoulli trial with p = 1/2.

The term is primarily descriptive and does not imply a specific standard beyond its use as a label for binary choice; contexts may vary from mathematics to programming to everyday decision making.