Lodash多维采摘 [英] lodash multidimensional pluck

问题描述

使用lodash库，我希望能够按照以下方式将多个值提取到多维数组中:

With the lodash library, I'd like to be able to pluck multiple values into a multi-dimensional array, along the lines of:

var arr = [{ a: 2, b: 3, c: 4 }, { a: 1, b: 4, c: 2 }];

_.pluck(arr, ['a', 'c']) --> [[2, 4], [1, 2]]

这可能吗?

谢谢.

推荐答案

多个键没有拨动，但是您可以这样做:

There is no pluck on multiple keys, but you can do this:

_.map(['a', 'c'], function(path) {
  return _.pluck(arr, path);
});

这将返回按键分组的值.

This will return values grouped by key.

_.mpluck = function(collection, paths) {
  return _.zip(
    _.map(paths, function(path) {
      return _.pluck(collection, path);
    })
  );
}

var arr = [{ a: 2, b: 3, c: 4 }, { a: 1, b: 4, c: 2 }];

_.mpluck(arr, ['a', 'c']) --> [[2, 4], [1, 2]]

这将用指定键的数组替换每个对象.

this will replace each object by an array of the specified keys.

function mpluck(collection, paths) {
  return collection.map(function(obj) {
    return paths.map(function(path) {
      return obj[path];
    });
  });
}

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