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42 lines
1.4 KiB
JavaScript
42 lines
1.4 KiB
JavaScript
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var arrayMap = require('./_arrayMap'),
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baseIntersection = require('./_baseIntersection'),
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baseRest = require('./_baseRest'),
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castArrayLikeObject = require('./_castArrayLikeObject'),
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last = require('./last');
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/**
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* This method is like `_.intersection` except that it accepts `comparator`
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* which is invoked to compare elements of `arrays`. The order and references
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* of result values are determined by the first array. The comparator is
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* invoked with two arguments: (arrVal, othVal).
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category Array
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* @param {...Array} [arrays] The arrays to inspect.
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* @param {Function} [comparator] The comparator invoked per element.
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* @returns {Array} Returns the new array of intersecting values.
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* @example
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*
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* var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
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* var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
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*
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* _.intersectionWith(objects, others, _.isEqual);
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* // => [{ 'x': 1, 'y': 2 }]
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*/
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var intersectionWith = baseRest(function(arrays) {
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var comparator = last(arrays),
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mapped = arrayMap(arrays, castArrayLikeObject);
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comparator = typeof comparator == 'function' ? comparator : undefined;
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if (comparator) {
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mapped.pop();
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}
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return (mapped.length && mapped[0] === arrays[0])
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? baseIntersection(mapped, undefined, comparator)
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: [];
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});
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module.exports = intersectionWith;
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