PropertiesFrom

Propertiesfrom is a term used in programming and data transformation to describe a function or operation that derives a set of properties from a source object, record, or data stream. It is typically used to create a new object that includes only the selected properties, or to compute new properties from existing ones. The name and capitalization vary in libraries, with forms such as propertiesFrom or PropertiesFrom appearing in documentation and code examples.

In practice, propertiesfrom takes a source input and a specification that selects which properties to include or how to compute them. The specification may be a list of property names, a mapping function, or a descriptor object that defines each output property and its derivation. The operation yields a new object or data structure containing the resulting properties. In many implementations the function is immutable, meaning the original source is not mutated.

Common use cases include shaping data for API responses, projecting database records, or preparing inputs for downstream processing. It can support default values for missing keys, nested property access, and property aliasing to rename fields. Behavior may vary by language or library, including how it handles missing data or conflicting properties.

Related concepts include projection, mapping, pluck, and destructuring. The exact syntax, capabilities, and error handling depend on the specific implementation being used. See the documentation of the relevant language or library for concrete details.