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var arrayMap = require('./_arrayMap'), | |
baseIntersection = require('./_baseIntersection'), | |
baseIteratee = require('./_baseIteratee'), | |
baseRest = require('./_baseRest'), | |
castArrayLikeObject = require('./_castArrayLikeObject'), | |
last = require('./last'); | |
/** | |
* This method is like `_.intersection` except that it accepts `iteratee` | |
* which is invoked for each element of each `arrays` to generate the criterion | |
* by which they're compared. The order and references of result values are | |
* determined by the first array. 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 intersecting values. | |
* @example | |
* | |
* _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor); | |
* // => [2.1] | |
* | |
* // The `_.property` iteratee shorthand. | |
* _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); | |
* // => [{ 'x': 1 }] | |
*/ | |
var intersectionBy = baseRest(function(arrays) { | |
var iteratee = last(arrays), | |
mapped = arrayMap(arrays, castArrayLikeObject); | |
if (iteratee === last(mapped)) { | |
iteratee = undefined; | |
} else { | |
mapped.pop(); | |
} | |
return (mapped.length && mapped[0] === arrays[0]) | |
? baseIntersection(mapped, baseIteratee(iteratee, 2)) | |
: []; | |
}); | |
module.exports = intersectionBy; | |