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/node_modules/lodash/intersectionBy.js

https://bitbucket.org/coleman333/smartsite
JavaScript | 45 lines | 19 code | 3 blank | 23 comment | 3 complexity | 9a1f37c1f6d641e40fc3e65bd0cb2fac MD5 | raw file
 1var arrayMap = require('./_arrayMap'),
 2    baseIntersection = require('./_baseIntersection'),
 3    baseIteratee = require('./_baseIteratee'),
 4    baseRest = require('./_baseRest'),
 5    castArrayLikeObject = require('./_castArrayLikeObject'),
 6    last = require('./last');
 7
 8/**
 9 * This method is like `_.intersection` except that it accepts `iteratee`
10 * which is invoked for each element of each `arrays` to generate the criterion
11 * by which they're compared. The order and references of result values are
12 * determined by the first array. The iteratee is invoked with one argument:
13 * (value).
14 *
15 * @static
16 * @memberOf _
17 * @since 4.0.0
18 * @category Array
19 * @param {...Array} [arrays] The arrays to inspect.
20 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
21 * @returns {Array} Returns the new array of intersecting values.
22 * @example
23 *
24 * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
25 * // => [2.1]
26 *
27 * // The `_.property` iteratee shorthand.
28 * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
29 * // => [{ 'x': 1 }]
30 */
31var intersectionBy = baseRest(function(arrays) {
32  var iteratee = last(arrays),
33      mapped = arrayMap(arrays, castArrayLikeObject);
34
35  if (iteratee === last(mapped)) {
36    iteratee = undefined;
37  } else {
38    mapped.pop();
39  }
40  return (mapped.length && mapped[0] === arrays[0])
41    ? baseIntersection(mapped, baseIteratee(iteratee, 2))
42    : [];
43});
44
45module.exports = intersectionBy;