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lodash源码分析之get #73

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HeftyKoo opened this issue Feb 9, 2020 · 0 comments
Open

lodash源码分析之get #73

HeftyKoo opened this issue Feb 9, 2020 · 0 comments
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api 暴露出来的接口 系列文章

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@HeftyKoo
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HeftyKoo commented Feb 9, 2020

本文为读 lodash 源码的第七十二篇,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 baseGet from './.internal/baseGet.js'

《lodash源码分析之baseGet》

源码分析

get 函数可以对对象或者数组深层取值,主要功能是由 baseGet 函数来实现,但是 get 函数可以设置默认值。

function get(object, path, defaultValue) {
  const result = object == null ? undefined : baseGet(object, path)
  return result === undefined ? defaultValue : result
}

首先判断 object 是否存在,如果不存在则 result 直接为 undefined,否则使用 baseGet 取值。

接着判断返回的 result 是否为 undefined,如果为 undefined,则返回默认值 defaultValue,否则返回取值结果 result

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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