许多编程语言支持字段索引的概念，字段索引用于访问重复字段的特定实例。

Many programming languages support the concept of a field index for accessing a particular occurrence of a repeating field.

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希望我们介绍的这些创建和使用函数索引的方法能够帮助您改善查询搜索的性能。

Hopefully by seeing the various ways that functional indexes are created and used, you will be able to use them to improve the performance of your query searches.

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尽管Knuth曾经忠告我们：“不成熟的优化是问题的根源”，但索引的目的在于快速地找到信息，因此本专栏同时也将讨论性能问题。

While Knuth has justly warned that "premature optimization is the root of all evil," the whole point of an index is to find information fast, so this column addresses performance issues as well.

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Otherwise I'm going to check to see is the first and last, there's that - 1 indexing, is the first and last element of the string the same?

是第一个还是最后一个,这就是这边-1的索引内容，这个字符串的第一个,和最后一个的内容是否相同呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

And then, when I got- I'm also going to count how many comparisons I do, just so I can see how much work I do here, and then notice what it does.

并能看到算法干了些什么-,然后是如果这个索引,比数组的大小小的话，就意味着还没检索到数组的最后。

麻省理工公开课 - 计算机科学及编程导论课程节选

But bad things will start to happen if I don't mind this lesson of indexing.

但是坏事情将发生,如果我不注意索引的教训。

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