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# The Expressions Module for Apache Lucene

 The expressions module is new to Lucene 4.6. It provides an API for dynamically computing per-document values based on string expressions. 

 The module is organized in two sections: 1. [](xref:Lucene.Net.Expressions) - The abstractions and simple utilities for common operations like sorting on an expression 2. [](xref:Lucene.Net.Expressions.Js) - A compiler for a subset of JavaScript expressions 

 For sample code showing how to use the API, see [](xref:Lucene.Net.Expressions.Expression). 