39 lines
1.3 KiB
JavaScript
39 lines
1.3 KiB
JavaScript
|
import _curry2 from "./internal/_curry2.js";
|
||
|
|
import ap from "./ap.js";
|
||
|
|
import map from "./map.js";
|
||
|
|
import prepend from "./prepend.js";
|
||
|
|
import reduceRight from "./reduceRight.js";
|
||
|
|
/**
|
||
|
|
* Transforms a [Traversable](https://github.com/fantasyland/fantasy-land#traversable)
|
||
|
|
* of [Applicative](https://github.com/fantasyland/fantasy-land#applicative) into an
|
||
|
|
* Applicative of Traversable.
|
||
|
|
*
|
||
|
|
* Dispatches to the `sequence` method of the second argument, if present.
|
||
|
|
*
|
||
|
|
* @func
|
||
|
|
* @memberOf R
|
||
|
|
* @since v0.19.0
|
||
|
|
* @category List
|
||
|
|
* @sig (Applicative f, Traversable t) => (a -> f a) -> t (f a) -> f (t a)
|
||
|
|
* @param {Function} of
|
||
|
|
* @param {*} traversable
|
||
|
|
* @return {*}
|
||
|
|
* @see R.traverse
|
||
|
|
* @example
|
||
|
|
*
|
||
|
|
* R.sequence(Maybe.of, [Just(1), Just(2), Just(3)]); //=> Just([1, 2, 3])
|
||
|
|
* R.sequence(Maybe.of, [Just(1), Just(2), Nothing()]); //=> Nothing()
|
||
|
|
*
|
||
|
|
* R.sequence(R.of, Just([1, 2, 3])); //=> [Just(1), Just(2), Just(3)]
|
||
|
|
* R.sequence(R.of, Nothing()); //=> [Nothing()]
|
||
|
|
*/
|
||
|
|
|
||
|
|
var sequence =
|
||
|
|
/*#__PURE__*/
|
||
|
|
_curry2(function sequence(of, traversable) {
|
||
|
|
return typeof traversable.sequence === 'function' ? traversable.sequence(of) : reduceRight(function (x, acc) {
|
||
|
|
return ap(map(prepend, x), acc);
|
||
|
|
}, of([]), traversable);
|
||
|
|
});
|
||
|
|
|
||
|
|
export default sequence;
|