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45 lines
1.3 KiB
TypeScript
45 lines
1.3 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/sequence.js
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import _curry2 from './internal/_curry2.js';
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import ap from './ap.js';
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import map from './map.js';
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import prepend from './prepend.js';
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import reduceRight from './reduceRight.js';
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/**
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* Transforms a [Traversable](https://github.com/fantasyland/fantasy-land#traversable)
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* of [Applicative](https://github.com/fantasyland/fantasy-land#applicative) into an
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* Applicative of Traversable.
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*
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* Dispatches to the `sequence` method of the second argument, if present.
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*
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* @func
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* @memberOf R
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* @since v0.19.0
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* @category List
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* @sig (Applicative f, Traversable t) => (a -> f a) -> t (f a) -> f (t a)
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* @param {Function} of
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* @param {*} traversable
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* @return {*}
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* @see R.traverse
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* @example
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*
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* R.sequence(Maybe.of, [Just(1), Just(2), Just(3)]); //=> Just([1, 2, 3])
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* R.sequence(Maybe.of, [Just(1), Just(2), Nothing()]); //=> Nothing()
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*
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* R.sequence(R.of, Just([1, 2, 3])); //=> [Just(1), Just(2), Just(3)]
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* R.sequence(R.of, Nothing()); //=> [Nothing()]
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*/
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var sequence = _curry2(function sequence(of, traversable) {
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return typeof traversable.sequence === 'function' ?
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traversable.sequence(of) :
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reduceRight(
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function(x, acc) { return ap(map(prepend, x), acc); },
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of([]),
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traversable
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);
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});
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export default sequence;
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