45 lines
1.4 KiB
JavaScript
45 lines
1.4 KiB
JavaScript
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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