<A>(combiner: Combiner<A>): Combiner<A>Reverses the argument order of a combiner's combine method.
When to use
Use when you want the right-hand value to act as the accumulator, or need to reverse a non-commutative combiner such as string concatenation.
Details
Returns a new Combiner where combine(self, that) calls the original
combiner as combine(that, self).
Example (Reversing string concatenation)
import { Combiner, String } from "effect"
const Prepend = Combiner.flip(String.ReducerConcat)
console.log(Prepend.combine("a", "b"))
// Output: "ba"export function function flip<A>(
combiner: Combiner<A>
): Combiner<A>
Reverses the argument order of a combiner's combine method.
When to use
Use when you want the right-hand value to act as the accumulator, or need to
reverse a non-commutative combiner such as string concatenation.
Details
Returns a new Combiner where combine(self, that) calls the original
combiner as combine(that, self).
Example (Reversing string concatenation)
import { Combiner, String } from "effect"
const Prepend = Combiner.flip(String.ReducerConcat)
console.log(Prepend.combine("a", "b"))
// Output: "ba"
flip<function (type parameter) A in flip<A>(combiner: Combiner<A>): Combiner<A>A>(combiner: Combiner<A>(parameter) combiner: {
combine: (self: A, that: A) => A;
}
interface Combiner<A>Represents a strategy for combining two values of the same type A. A
Combiner contains a single combine method that takes two values and
returns a merged result. It does not include an identity/empty value; use
Reducer when you need one.
When to use
Use when you need to describe how two values of the same type
merge, pass a reusable combining strategy to library functions like
Struct.makeCombiner or Option.makeCombinerFailFast, or define the
combining step for a Reducer.
Example (Combining numbers with addition)
import { Combiner } from "effect"
const Sum = Combiner.make<number>((self, that) => self + that)
console.log(Sum.combine(3, 4))
// Output: 7
Combiner<function (type parameter) A in flip<A>(combiner: Combiner<A>): Combiner<A>A>): interface Combiner<A>Represents a strategy for combining two values of the same type A. A
Combiner contains a single combine method that takes two values and
returns a merged result. It does not include an identity/empty value; use
Reducer when you need one.
When to use
Use when you need to describe how two values of the same type
merge, pass a reusable combining strategy to library functions like
Struct.makeCombiner or Option.makeCombinerFailFast, or define the
combining step for a Reducer.
Example (Combining numbers with addition)
import { Combiner } from "effect"
const Sum = Combiner.make<number>((self, that) => self + that)
console.log(Sum.combine(3, 4))
// Output: 7
Combiner<function (type parameter) A in flip<A>(combiner: Combiner<A>): Combiner<A>A> {
return function make<A>(
combine: (self: A, that: A) => A
): Combiner<A>
Creates a Combiner from a binary function.
When to use
Use when you have a custom combining operation that is not covered by
the built-in constructors (min, max, first, last, constant).
Details
The returned combiner's combine method delegates to the provided function.
Any purity, associativity, or mutation behavior comes from that function.
Example (Multiplying numbers)
import { Combiner } from "effect"
const Product = Combiner.make<number>((self, that) => self * that)
console.log(Product.combine(3, 5))
// Output: 15
make((self: Aself, that: Athat) => combiner: Combiner<A>(parameter) combiner: {
combine: (self: A, that: A) => A;
}
Combiner<A>.combine: (self: A, that: A) => ACombines two values into a new value.
When to use
Use to merge two values according to this combining strategy.
combine(that: Athat, self: Aself))
}