fp-ts/es6/Magma.d.ts

Functional programming in TypeScript

/**
 * A `Magma` is a pair `(A, concat)` in which `A` is a non-empty set and `concat` is a binary operation on `A`
 *
 * See [Semigroup](https://gcanti.github.io/fp-ts/modules/Semigroup.ts.html) for some instances.
 *
 * @category type classes
 * @since 2.0.0
 */
export interface Magma<A> {
  readonly concat: (x: A, y: A) => A
}