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lodash源码分析之baseToString #254

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HeftyKoo opened this issue May 5, 2020 · 0 comments
Open

lodash源码分析之baseToString #254

HeftyKoo opened this issue May 5, 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 5, 2020

本文为读 lodash 源码的第二百五十三篇,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 isSymbol from '../isSymbol.js'

《lodash源码分析之isSymbol》

源码分析

baseToString 的逻辑作为一个内部函数,作用和 toString 基本一样,之所以不直接使用 toString ,和 baseToNumber 一样,都基于同样的理由,出于性能的考虑。

源码如下:

const INFINITY = 1 / 0
const symbolToString = Symbol.prototype.toString
function baseToString(value) {
  if (typeof value === 'string') {
    return value
  }
  if (Array.isArray(value)) {
    return `${value.map(baseToString)}`
  }
  if (isSymbol(value)) {
    return symbolToString ? symbolToString.call(value) : ''
  }
  const result = `${value}`
  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result
}

源码基本和 toString 一致,但是不会处理 nullundefined

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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