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x/ramda/source/intersection.js

:ram: Practical functional Javascript
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import _includes from './internal/_includes.js';import _curry2 from './internal/_curry2.js';import _filter from './internal/_filter.js';import flip from './flip.js';import uniq from './uniq.js';

/** * Combines two lists into a set (i.e. no duplicates) composed of those * elements common to both lists. * * @func * @memberOf R * @since v0.1.0 * @category Relation * @sig [*] -> [*] -> [*] * @param {Array} list1 The first list. * @param {Array} list2 The second list. * @return {Array} The list of elements found in both `list1` and `list2`. * @see R.innerJoin * @example * * R.intersection([1,2,3,4], [7,6,5,4,3]); //=> [4, 3] */var intersection = _curry2(function intersection(list1, list2) { var lookupList, filteredList; if (list1.length > list2.length) { lookupList = list1; filteredList = list2; } else { lookupList = list2; filteredList = list1; } return uniq(_filter(flip(_includes)(lookupList), filteredList));});export default intersection;