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var baseFlatten = require('./_baseFlatten'), | |
baseIteratee = require('./_baseIteratee'), | |
baseRest = require('./_baseRest'), | |
baseUniq = require('./_baseUniq'), | |
isArrayLikeObject = require('./isArrayLikeObject'), | |
last = require('./last'); | |
/** | |
* This method is like `_.union` except that it accepts `iteratee` which is | |
* invoked for each element of each `arrays` to generate the criterion by | |
* which uniqueness is computed. Result values are chosen from the first | |
* array in which the value occurs. The iteratee is invoked with one argument: | |
* (value). | |
* | |
* @static | |
* @memberOf _ | |
* @since 4.0.0 | |
* @category Array | |
* @param {...Array} [arrays] The arrays to inspect. | |
* @param {Function} [iteratee=_.identity] The iteratee invoked per element. | |
* @returns {Array} Returns the new array of combined values. | |
* @example | |
* | |
* _.unionBy([2.1], [1.2, 2.3], Math.floor); | |
* // => [2.1, 1.2] | |
* | |
* // The `_.property` iteratee shorthand. | |
* _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); | |
* // => [{ 'x': 1 }, { 'x': 2 }] | |
*/ | |
var unionBy = baseRest(function(arrays) { | |
var iteratee = last(arrays); | |
if (isArrayLikeObject(iteratee)) { | |
iteratee = undefined; | |
} | |
return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), baseIteratee(iteratee, 2)); | |
}); | |
module.exports = unionBy; | |