如何在nodejs中使用lodash/下划线找到两个数组之间的差异 [英] how to find difference between two array using lodash/underscore in nodejs
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问题描述
我有两个数组的数组,正在尝试找出差异.
I have two arrays of arrays and am trying to find the difference.
var a = [[ 11, 24, 28, 38, 42, 44 ],
[ 7, 19, 21, 22, 29, 38 ],
[ 2, 21, 27, 30, 33, 40 ],
[ 6, 11, 12, 21, 34, 48 ],
[ 1, 10, 17, 31, 35, 40 ],
[ 1, 18, 26, 33, 36, 45 ],
[ 15, 21, 22, 24, 38, 46 ],
[ 5, 17, 21, 27, 29, 41 ],
[ 3, 7, 12, 16, 20, 28 ],
[ 9, 12, 13, 18, 30, 37 ],
[ 3, 19, 21, 31, 33, 46 ],
[ 6, 11, 16, 18, 20, 34 ],
[ 1, 3, 11, 13, 24, 28 ],
[ 12, 13, 16, 40, 42, 46 ],
[ 1, 3, 5, 36, 37, 41 ],
[ 14, 15, 23, 24, 26, 31 ],
[ 7, 13, 14, 15, 27, 28 ]];
var b = [[ 4, 7, 9, 21, 31, 36 ],
[ 2, 5, 6, 12, 15, 21 ],
[ 4, 7, 8, 15, 38, 41 ],
[ 11, 24, 28, 38, 42, 44 ],
[ 7, 19, 21, 22, 29, 38 ]];
我将如何找到:
c = [[ 2, 21, 27, 30, 33, 40 ],
[ 6, 11, 12, 21, 34, 48 ],
[ 1, 10, 17, 31, 35, 40 ],
[ 1, 18, 26, 33, 36, 45 ],
[ 15, 21, 22, 24, 38, 46 ],
[ 5, 17, 21, 27, 29, 41 ],
[ 3, 7, 12, 16, 20, 28 ],
[ 9, 12, 13, 18, 30, 37 ],
[ 3, 19, 21, 31, 33, 46 ],
[ 6, 11, 16, 18, 20, 34 ],
[ 1, 3, 11, 13, 24, 28 ],
[ 12, 13, 16, 40, 42, 46 ],
[ 1, 3, 5, 36, 37, 41 ],
[ 14, 15, 23, 24, 26, 31 ],
[ 7, 13, 14, 15, 27, 28 ]];
我曾尝试使用下划线:
_ = require('underscore');
_.difference(a,b);
但这是行不通的.
我也尝试过lodash:
I also tried lodash:
_ = require('lodash');
_.differenceBy(a,b);
但它也不起作用.
我在做什么错了?
推荐答案
使用_.differenceWith
,并传递一个比较两个数组的比较器,如下所示:
Use _.differenceWith
, and pass a comparator which compares two arrays, as in:
_.differenceWith(a, b, _.isEqual);
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