effect-ts-folds/src/util/Pair.js

Recursion schemes for effect-ts.

import { Either as EI, flow, Tuple } from 'effect';
/**
 * Run a pair of functions on the same value and return the result tuple.
 * @category pair
 */
export const fanout = (ab, ac) => (a) => [ab(a), ac(a)];
/**
 * Convert a pair of functions into a function that runs the first on left and
 * the second on right.
 * @category pair
 */
export const fanin = (ba, ca) => EI.match({ onLeft: ba, onRight: ca });
/**
 * Map over both members of a pair with a single function.
 * @category pair
 */
export const pairMap = (ab) => ([a1, a2]) => [ab(a1), ab(a2)];
export const pairWithFirst = (first) => (second) => [first, second];
export const pairWithSecond = (second) => (first) => [first, second];
export const square = (a) => [a, a];
export const squareMapFirst = f => flow(square, Tuple.mapFirst(f));
export const pair = (a, b) => [a, b];
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