Where does reducer collide?

In chemistry a reducer, or reducing agent, is a substance that gives up electrons to another species in a redox reaction, lowering that species' oxidation state while itself being oxidised. The IUPAC Compendium of chemical terminology defines reduction, the change a reducing agent brings about, and Yorimitsu and Oshima's 2012 Reduction with inorganic reducing agents surveys the broader class. The referent is an electron donor defined by its reducing power, a construct unrelated to a pipe fitting or a software function beyond the shared idea of lowering or reducing something.[1][2]

Unit

The electron-donating, or reducing, power of the substance

Recovery means

Not applicable

Measured by

Ranked by standard reduction potential and by the reactions a given agent can drive

In programming a reducer is the function supplied to a reduce, or fold, operation: it takes a running accumulator and the next element of a collection and returns the updated accumulator, so repeatedly applying it collapses a whole list into a single value or state. Hutton's 1999 A tutorial on the universality and expressiveness of fold sets out the theory of the fold operation this function drives. The referent is a combining function defined by its role in a fold, with nothing in common with a reducing agent or a pipe reducer except the word for making many into fewer.[3]

Unit

The combining function applied across a collection in a fold

Recovery means

Not applicable

Measured by

Characterised by the accumulator type and the combining step it defines within a fold