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lodash源码分析之baseIsEqual #220

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HeftyKoo opened this issue May 1, 2020 · 0 comments
Open

lodash源码分析之baseIsEqual #220

HeftyKoo opened this issue May 1, 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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HeftyKoo commented May 1, 2020

本文为读 lodash 源码的第二百一十九篇,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 baseIsEqualDeep from './baseIsEqualDeep.js'
import isObjectLike from '../isObjectLike.js'

《lodash源码分析之baseIsEqualDeep》
《lodash源码分析之isObjectLike》

源码分析

经过之前一系列内部函数的铺垫,baseIsEqual 的实现就相对简单了。

源码如下:

function baseIsEqual(value, other, bitmask, customizer, stack) {
  if (value === other) {
    return true
  }
  if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
    return value !== value && other !== other
  }
  return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack)
}

如果 valueother 经过是全等的,这是最简单的了,两个值肯定相等。

接下来再比较 NaN ,如果两个值 value !== valueother !== other 都为 true ,表示这两个值都为 NaN ,也返回 true

进行了简单的比较后,依然得不到结果,则调用 baseIsEqualDeep 来比较,这里要注意第五个参数,也即之前经常出来的 equalFunc ,传入的是 baseIsEqual ,这也是之前一系列函数会递归的原因。

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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