lodash的_.map和_.pluck有什么区别? [英] What is the difference between lodash's _.map and _.pluck?

问题描述

我有以下代码，任何人都可以分辨出区别:

I have the following code, can anyone tell the difference:

const _ = require('lodash');

const arr = [
    {'fname':'Ali', 'lname': 'Yousuf'},
    {'fname': 'Uzair', 'lname': 'Ali'},
    {'fname': 'Umair', 'lname': 'Khan'}
];

_.map(arr, 'fname');
_.pluck(arr, 'fname');

输出是相同的，并且两个函数都没有对arr进行突变.

The output is the same, and both functions are not mutating arr.

推荐答案

在您使用它们的方式中，它们基本上会执行相同的操作.这就是为什么从Lodash v4.0.0中删除了.pluck()，而赞成使用带有字符串作为第二个参数的.map()的原因.

In the way you're using them, they basically do the same. That's why .pluck() was removed from Lodash v4.0.0 in favor of using .map() with a string as second argument.

以下是更改日志的相关摘录:

Here's the relevant excerpt from the changelog:

以iteratee的速记方式将_.pluck取而代之的是_.map

var objects = [{ 'a': 1 }, { 'a': 2 }];

// in 3.10.1
_.pluck(objects, 'a'); // → [1, 2]
_.map(objects, 'a'); // → [1, 2]

// in 4.0.0
_.map(objects, 'a'); // → [1, 2]

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