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JS算法相关: 数组中有10万条数据, 取第1条和第10万条的时间相差多少 #91

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leslie1943 opened this issue Dec 14, 2020 · 0 comments

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leslie1943 commented Dec 14, 2020 •

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结论

消耗时间几乎一致(差异可以忽略不计)

原因

JavaScript中没有真正的数组, 所有的数组其实都是对象, 其索引看起来是数字,其实会被转换成字符串, 作为属性名(对象的key)来使用, 所以无论是取第1个还是取第10万个, 都是使用key精确查找哈比表的过程, 消耗时间大致相同.

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