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39 lines
1.3 KiB
39 lines
1.3 KiB
var baseFlatten = require('./_baseFlatten'), |
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baseIteratee = require('./_baseIteratee'), |
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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 `iteratee` which is |
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* invoked for each element of each `arrays` to generate the criterion by |
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* which uniqueness is computed. Result values are chosen from the first |
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* array in which the value occurs. The iteratee is invoked with one argument: |
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* (value). |
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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} [iteratee=_.identity] The iteratee 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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* _.unionBy([2.1], [1.2, 2.3], Math.floor); |
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* // => [2.1, 1.2] |
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* |
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* // The `_.property` iteratee shorthand. |
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* _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); |
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* // => [{ 'x': 1 }, { 'x': 2 }] |
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*/ |
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var unionBy = baseRest(function(arrays) { |
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var iteratee = last(arrays); |
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if (isArrayLikeObject(iteratee)) { |
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iteratee = undefined; |
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} |
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return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), baseIteratee(iteratee, 2)); |
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}); |
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module.exports = unionBy;
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