37 lines
1.2 KiB
JavaScript
37 lines
1.2 KiB
JavaScript
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var baseFlatten = require('./_baseFlatten'),
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baseRest = require('./_baseRest'),
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baseUniq = require('./_baseUniq'),
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isArrayLikeObject = require('./isArrayLikeObject'),
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last = require('./last');
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/**
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* This method is like `_.union` except that it accepts `comparator` which
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* is invoked to compare elements of `arrays`. Result values are chosen from
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* the first array in which the value occurs. The comparator is invoked
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* 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 combined 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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* _.unionWith(objects, others, _.isEqual);
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* // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
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*/
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var unionWith = baseRest(function(arrays) {
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var comparator = last(arrays);
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if (isArrayLikeObject(comparator)) {
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comparator = undefined;
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}
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return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
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});
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module.exports = unionWith;
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