Requesting Heterogeneous Data Sourceswith Array Comprehensions in Hop.js

International audienceDuring the past few years the volume of accumulated data has in-creased dramatically. New kinds of data stores have emerged asNoSQL family stores. Many modern applications now collect, analyze, and produce data from several heterogeneous sources. How-ever implementing such applications is still difficult because of lackof appropriate tools and formalisms. We propose a solution to thisproblem in the context of the JavaScript programming language byextending array comprehensions. Our extension allows program-mers to query data from usual stores, such as SQL databases,NoSQL databases, Semantic Web data repositories, Web pages, oreven custom user defined data structures. The extension has beenimplemented in the Hop.js system. It is the subject of this paper