1 | var arrayMap = require('./_arrayMap'),
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2 | baseIntersection = require('./_baseIntersection'),
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3 | baseIteratee = require('./_baseIteratee'),
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4 | baseRest = require('./_baseRest'),
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5 | castArrayLikeObject = require('./_castArrayLikeObject'),
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6 | last = require('./last');
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7 |
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8 | /**
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9 | * This method is like `_.intersection` except that it accepts `iteratee`
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10 | * which is invoked for each element of each `arrays` to generate the criterion
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11 | * by which they're compared. The order and references of result values are
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12 | * determined by the first array. The iteratee is invoked with one argument:
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13 | * (value).
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14 | *
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15 | * @static
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16 | * @memberOf _
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17 | * @since 4.0.0
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18 | * @category Array
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19 | * @param {...Array} [arrays] The arrays to inspect.
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20 | * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
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21 | * @returns {Array} Returns the new array of intersecting values.
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22 | * @example
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23 | *
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24 | * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
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25 | * // => [2.1]
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26 | *
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27 | * // The `_.property` iteratee shorthand.
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28 | * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
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29 | * // => [{ 'x': 1 }]
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30 | */
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31 | var intersectionBy = baseRest(function(arrays) {
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32 | var iteratee = last(arrays),
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33 | mapped = arrayMap(arrays, castArrayLikeObject);
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34 |
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35 | if (iteratee === last(mapped)) {
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36 | iteratee = undefined;
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37 | } else {
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38 | mapped.pop();
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39 | }
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40 | return (mapped.length && mapped[0] === arrays[0])
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41 | ? baseIntersection(mapped, baseIteratee(iteratee, 2))
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42 | : [];
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43 | });
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44 |
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45 | module.exports = intersectionBy;
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