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lodash源码分析之isObject #51

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HeftyKoo opened this issue Dec 11, 2019 · 0 comments
Open

lodash源码分析之isObject #51

HeftyKoo opened this issue Dec 11, 2019 · 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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本文为读 lodash 源码的第五十篇,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

源码分析

isObject 用来判断一个值是否为 object 类型。

这个方法最主要的一点就是排除了 null ,看下源码的实现:

function isObject(value) {
  const type = typeof value
  return value != null && (type === 'object' || type === 'function')
}

可以看到,isObject 是基于 typeof 来实现的,typeof null 会返回 object, 因此需要将 null 排除掉。

另外 function 其实也是 object 类型,但是用 typeof来判断时,会返回 function ,所以也要对函数进行特殊的处理。

相关链接

ECMA规范

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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