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45 lines
1.5 KiB
TypeScript
45 lines
1.5 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/traverse.js
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import _curry3 from './internal/_curry3.js';
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import map from './map.js';
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import sequence from './sequence.js';
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/**
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* Maps an [Applicative](https://github.com/fantasyland/fantasy-land#applicative)-returning
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* function over a [Traversable](https://github.com/fantasyland/fantasy-land#traversable),
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* then uses [`sequence`](#sequence) to transform the resulting Traversable of Applicative
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* into an Applicative of Traversable.
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*
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* Dispatches to the `traverse` method of the third 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) -> (a -> f b) -> t a -> f (t b)
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* @param {Function} of
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* @param {Function} f
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* @param {*} traversable
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* @return {*}
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* @see R.sequence
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* @example
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*
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* // Returns `Maybe.Nothing` if the given divisor is `0`
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* const safeDiv = n => d => d === 0 ? Maybe.Nothing() : Maybe.Just(n / d)
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*
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* R.traverse(Maybe.of, safeDiv(10), [2, 4, 5]); //=> Maybe.Just([5, 2.5, 2])
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* R.traverse(Maybe.of, safeDiv(10), [2, 0, 5]); //=> Maybe.Nothing
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*/
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var traverse = _curry3(function traverse(of, f, traversable) {
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return (
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typeof traversable['fantasy-land/traverse'] === 'function'
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? traversable['fantasy-land/traverse'](f, of)
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: typeof traversable.traverse === 'function'
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? traversable.traverse(f, of)
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: sequence(of, map(f, traversable))
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);
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});
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export default traverse;
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