3.30 在结果中包含索引--withIndex,indexe介绍 Including an index with results - introducing withIndex and indexed 实用的小精灵（Gremlin图查询语言） 阿岶奇TinkerPop向导 PRACTICAL GREMLIN An Apache TinkerPop Tutorial

如果出于一些原因，您需要索引包含在查询结果中，您可以像下面这样使用Groovy的withIndex或者indexed方法。

If for any reason you wanted an index value included as part of the results from a query you can

use the Groovy withIndex or indexed methods as shown below.

这些内容将在下一节中讲到，小精灵原生index步骤是在阿帕奇Tinkerpop3.4版本中开始引入的。

As covered in the next section, a native Gremlin index step was introduced in the

Apache TinkerPop 3.4 release.

withIndex是把索引加在了列表的最后，而indexed方法是把索引加在了开始。您可以提供一个参数做为索引的开始值。如果没有提供开始值，默认的索引开始值就是0.

The withIndex method adds the index value at the end of a list whereas the indexed method adds it

at the start. You can provide a starting index value as a parameter. If no value is provided the

default value for the first index will be zero.

 

 

注意indexed,withIndex是Groovy语句的方法，而不是小精灵遍历语言中的步骤。它们只能用在允许使用Groovy代码做为查询语句的一部分的图数据库中。

Note that indexed and withIndex are Groovy methods and not Gremlin traversal

steps. They will only work using graph databases that allow Groovy code to be

included as part of a query.

这是同一个查询但是索引的开始是数字1.

Here is the same query as before but using 1 as the starting index.

 

 

这个查询又用了一次，但是这次用indexed方法来生成索引的值。

Below is the query used again but this time with the indexed method being used to generate the

index value.