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48 lines
1.3 KiB
TypeScript
48 lines
1.3 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/difference.js
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import _curry2 from './internal/_curry2.js';
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import _Set from './internal/_Set.js';
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/**
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* Finds the set (i.e. no duplicates) of all elements in the first list not
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* contained in the second list. Objects and Arrays are compared in terms of
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* value equality, not reference equality.
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*
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* @func
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* @memberOf R
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* @since v0.1.0
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* @category Relation
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* @sig [*] -> [*] -> [*]
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* @param {Array} list1 The first list.
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* @param {Array} list2 The second list.
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* @return {Array} The elements in `list1` that are not in `list2`.
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* @see R.differenceWith, R.symmetricDifference, R.symmetricDifferenceWith, R.without
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* @example
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*
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* R.difference([1,2,3,4], [7,6,5,4,3]); //=> [1,2]
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* R.difference([7,6,5,4,3], [1,2,3,4]); //=> [7,6,5]
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* R.difference([{a: 1}, {b: 2}], [{a: 1}, {c: 3}]) //=> [{b: 2}]
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*/
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var difference = _curry2(function difference(first, second) {
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var out = [];
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var idx = 0;
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var firstLen = first.length;
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var secondLen = second.length;
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var toFilterOut = new _Set();
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for (var i = 0; i < secondLen; i += 1) {
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toFilterOut.add(second[i]);
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}
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while (idx < firstLen) {
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if (toFilterOut.add(first[idx])) {
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out[out.length] = first[idx];
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}
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idx += 1;
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}
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return out;
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});
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export default difference;
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