Lodash从3变为4，导致该代码无法正常工作?

问题描述

我有这样的代码:

const _ = require('lodash');

const fn = _.partialRight(_.pick, _.identity);

const x = { some: 'value', empty: null };

const y = fn(x);

console.log('x:', x);
console.log('y:', y);

fn应该删除空属性

Lodash 3.10.1的结果:

Result with Lodash 3.10.1:

x: { some: 'value', empty: null }
y: { some: 'value' }

Lodash 4.15.0的结果:

Result with Lodash 4.15.0:

x: { some: 'value', empty: null }
y: {}

在Lodash 4中，什么不再起作用了?

What has changed in Lodash 4 that it's not working anymore?

推荐答案

将您的const fn = _.partialRight(_.pick, _.identity)更改为const fn = _.partialRight(_.pickBy, _.identity);

_.pick过去只是一个功能，但在最新更新中将其分解为_.pick和_.pickBy.您将在传递已知键时使用_.pick，而在使用自定义函数来测试是否应根据自己的参数选择键/值时使用_.pickBy

_.pick used to be just one function but they broke it out into _.pick and _.pickBy in the latest updates. you would use _.pick when you are passing in known keys and _.pickBy when you are using a custom function to test if a key/value should be picked based on your own parameters,

https://lodash.com/docs/4.15.0#pick

https://lodash.com/docs/4.15.0#pickBy

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