| 1 | var baseFlatten = require('./_baseFlatten'),
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| 2 | baseRest = require('./_baseRest'),
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| 3 | baseUniq = require('./_baseUniq'),
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| 4 | isArrayLikeObject = require('./isArrayLikeObject'),
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| 5 | last = require('./last');
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| 6 |
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| 7 | /**
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| 8 | * This method is like `_.union` except that it accepts `comparator` which
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| 9 | * is invoked to compare elements of `arrays`. Result values are chosen from
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| 10 | * the first array in which the value occurs. The comparator is invoked
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| 11 | * with two arguments: (arrVal, othVal).
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| 12 | *
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| 13 | * @static
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| 14 | * @memberOf _
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| 15 | * @since 4.0.0
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| 16 | * @category Array
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| 17 | * @param {...Array} [arrays] The arrays to inspect.
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| 18 | * @param {Function} [comparator] The comparator invoked per element.
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| 19 | * @returns {Array} Returns the new array of combined values.
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| 20 | * @example
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| 21 | *
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| 22 | * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
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| 23 | * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
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| 24 | *
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| 25 | * _.unionWith(objects, others, _.isEqual);
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| 26 | * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
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| 27 | */
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| 28 | var unionWith = baseRest(function(arrays) {
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| 29 | var comparator = last(arrays);
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| 30 | comparator = typeof comparator == 'function' ? comparator : undefined;
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| 31 | return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
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| 32 | });
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| 33 |
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| 34 | module.exports = unionWith;
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