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