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lodash源码分析之baseUnset #76

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HeftyKoo opened this issue Feb 13, 2020 · 0 comments
Open

lodash源码分析之baseUnset #76

HeftyKoo opened this issue Feb 13, 2020 · 0 comments
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internal 内部函数或方法 系列文章

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@HeftyKoo
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本文为读 lodash 源码的第七十五篇,后续文章会更新到这个仓库中,欢迎 star:pocket-lodash

gitbook也会同步仓库的更新,gitbook地址:pocket-lodash

依赖

import castPath from './castPath.js'
import last from '../last.js'
import parent from './parent.js'
import toKey from './toKey.js'

《lodash源码分析之castPath》

《lodash源码分析之last》

《lodash源码分析之parent》

《lodash源码分析之toKey》

源码分析

baseUnset 的作用是删除 object 中,指定属性路径 path 对应的值。删除成功返回 true。其中 path 可以是数组,也可以是属性路径字符串。

即可以是 ['a', 'b', 'c'],也可以是 a.b.c

源码如下:

function baseUnset(object, path) {
  path = castPath(path, object)
  object = parent(object, path)
  return object == null || delete object[toKey(last(path))]
}

首先调用 castPath 将属性路径规范化成数组的形式。

然后调用 parent 取出当前路径的父级的值。

如果父级的值为 null ,则表示这个属性路径下没有值,不需要删除,直接返回 object == null ,这种情况下,返回的值为 true

否则调用 last 取出属性路径的最后的属性,因为之前已经取出父级的值 object ,因此只需要对父级进行 delete 操作即可,也即 delete object[tokey(last(path))] 。其中 toKey 对属性进行一些规范化的转换。

License

署名-非商业性使用-禁止演绎 4.0 国际 (CC BY-NC-ND 4.0)

最后,所有文章都会同步发送到微信公众号上,欢迎关注,欢迎提意见:

作者:对角另一面

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