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lodash源码分析之customDefaultsMerge #281

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HeftyKoo opened this issue May 15, 2020 · 0 comments
Open

lodash源码分析之customDefaultsMerge #281

HeftyKoo opened this issue May 15, 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 源码的第二百八十篇,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 baseMerge from './baseMerge.js'
import isObject from '../isObject.js'

lodash源码分析之baseMerge

lodash源码分析之isObject

源码分析

customDefaultsMerge 会被 defaultsDeep 使用, defaultsDeep 可以合并多个对象, customDefaultsDeep 只合并两个对象。

源码如下:

function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
  if (isObject(objValue) && isObject(srcValue)) {
    stack.set(srcValue, objValue)
    baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack)
    stack['delete'](srcValue)
  }
  return objValue
}

因为调用的时候会和其它函数统一接口,因此会有一些多余的参数。

其实就是调用 baseMerge 来深度合并 objValuesrcValue ,这里用了 stack 来防止循环依赖的问题。

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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