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lodash源码分析之last #29

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HeftyKoo opened this issue Oct 1, 2018 · 0 comments
Open

lodash源码分析之last #29

HeftyKoo opened this issue Oct 1, 2018 · 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 Oct 1, 2018

我把我整个灵魂都给你,连同它的怪癖,耍小脾气,忽明忽暗,一千八百种坏毛病。它真讨厌,只有一点好,爱你。

——王小波

本文为读 lodash 源码的第二十八篇,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

last 函数用来获取数组的最后一项,源码如下:

function last(array) {
    const length = array == null ? 0 : array.length
    return length ? array[length - 1] : undefined
}

如果有传递数组,则用 array.length 获取数组的长度,没有传递数组,则 length 赋值为 0

如果数组长度存在,则返回数组最后一项,否则返回 undefined

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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