Inputhas

Inputhas is a term occasionally used in software development to describe a predicate or function that tests whether an input data object contains a requested field or satisfies a defined condition. It is not a formal standard in programming languages, and its exact meaning can vary between projects and languages.

Etymology and usage variants vary. The concept is usually expressed with naming variants such as inputHas, InputHas, or hasInput. The core idea is to verify the presence of a value or property within an input object before proceeding with further processing, routing, or validation. In practice, inputhas may appear in validation routines, feature detection checks, or conditional logic that gates downstream operations.

Typical patterns involve checking for the existence of a key or the presence of a non-null, non-undefined value. For example, a function named inputHas(data, key) might return true if the key exists in data and its value is not undefined, while a stricter form might require the value to be non-null as well.

Examples and variants vary by language. In JavaScript, a common approach is to implement inputHas as a small helper that checks for a property's existence on an object; in other languages, similar checks may be expressed with different syntax or built-in utilities. Some projects use a formal validation library or schema to replace ad hoc inputhas checks with standardized validation rules.

Limitations and practice. Because inputhas is not a standardized term, its exact semantics can be ambiguous. Relying solely on presence checks can be insufficient for security and data integrity; they should be combined with clear validation and type checks.

See also: input validation, data validation, feature detection, type checking.