import _curry3 from "./internal/_curry3.js"; import map from "./map.js"; import sequence from "./sequence.js"; /** * Maps an [Applicative](https://github.com/fantasyland/fantasy-land#applicative)-returning * function over a [Traversable](https://github.com/fantasyland/fantasy-land#traversable), * then uses [`sequence`](#sequence) to transform the resulting Traversable of Applicative * into an Applicative of Traversable. * * Dispatches to the `traverse` method of the third argument, if present. * * @func * @memberOf R * @since v0.19.0 * @category List * @sig fantasy-land/of :: TypeRep f => f ~> a -> f a * @sig (Applicative f, Traversable t) => TypeRep f -> (a -> f b) -> t a -> f (t b) * @sig (Applicative f, Traversable t) => (b -> f b) -> (a -> f b) -> t a -> f (t b) * @param {Object|Function} TypeRepresentative with an `of` or `fantasy-land/of` method * @param {Function} f * @param {*} traversable * @return {*} * @see R.sequence * @example * * // Returns `Maybe.Nothing` if the given divisor is `0` * const safeDiv = n => d => d === 0 ? Maybe.Nothing() : Maybe.Just(n / d) * * R.traverse(Maybe.of, safeDiv(10), [2, 4, 5]); //=> Maybe.Just([5, 2.5, 2]) * R.traverse(Maybe.of, safeDiv(10), [2, 0, 5]); //=> Maybe.Nothing * * // Using a Type Representative * R.traverse(Maybe, safeDiv(10), Right(4)); //=> Just(Right(2.5)) * R.traverse(Maybe, safeDiv(10), Right(0)); //=> Nothing * R.traverse(Maybe, safeDiv(10), Left("X")); //=> Just(Left("X")) */ var traverse = /*#__PURE__*/ _curry3(function traverse(F, f, traversable) { var of = typeof F['fantasy-land/of'] === 'function' ? F['fantasy-land/of'] : typeof F.of === 'function' ? F.of : F; var TypeRep = { 'fantasy-land/of': of }; return typeof traversable['fantasy-land/traverse'] === 'function' ? traversable['fantasy-land/traverse'](TypeRep, f) : typeof traversable.traverse === 'function' ? traversable.traverse(TypeRep, f) : sequence(TypeRep, map(f, traversable)); }); export default traverse;