1 | import baseFlatten from './_baseFlatten.js';
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2 | import baseIteratee from './_baseIteratee.js';
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3 | import baseRest from './_baseRest.js';
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4 | import baseUniq from './_baseUniq.js';
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5 | import isArrayLikeObject from './isArrayLikeObject.js';
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6 | import last from './last.js';
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7 |
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8 | /**
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9 | * This method is like `_.union` except that it accepts `iteratee` which is
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10 | * invoked for each element of each `arrays` to generate the criterion by
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11 | * which uniqueness is computed. Result values are chosen from the first
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12 | * array in which the value occurs. 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 combined values.
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22 | * @example
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23 | *
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24 | * _.unionBy([2.1], [1.2, 2.3], Math.floor);
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25 | * // => [2.1, 1.2]
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26 | *
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27 | * // The `_.property` iteratee shorthand.
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28 | * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
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29 | * // => [{ 'x': 1 }, { 'x': 2 }]
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30 | */
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31 | var unionBy = baseRest(function(arrays) {
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32 | var iteratee = last(arrays);
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33 | if (isArrayLikeObject(iteratee)) {
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34 | iteratee = undefined;
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35 | }
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36 | return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), baseIteratee(iteratee, 2));
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37 | });
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38 |
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39 | export default unionBy;
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