I asked this question on SO but was suggested to try here. So here it goes:My understanding of Javascript so far has been that it is a client-side language that capture events and makes a web-page dynamic.But on reading the comparison between MongoDB and CouchDB I noticed that both are using Javascript. This makes me wonder the reason behind the choice of JavaScript over other conventional languages.I guess I am trying to understand the role of JavaScript and its advantages over other languages.Update: I am not asking about the languages / drivers supported by the two databases. The comparison says: Both CouchDB and MongoDB make use of Javascript. CouchDB uses Javascript extensively including in the building of views.MongoDB also supports running arbitrary javascript functions server-side and uses javascript for map/reduce operations.My lack of understanding pertains to why is Javascript being used at all for the backend work. Why is it preferred for building views in CouchDB, or for using map/reduce operations? Why C/C++ or Java were not used? What are the advantages in using Javascript for such back-end work?
Why is Javascript used in MongoDB and CouchDB instead of other languages such as Java, C++?
java;javascript
Mobile code & Cross-platformJavaScript is what called mobile code, the code is transported from the server (MongoDB and CouchDB in this case) to the client (the web browser) and executed on the client without an installation process.JavaScript runtime environments (web browsers) are also widely available on many platforms. That makes JavaScript a good cross-platform language.JavaScript is not used as primary back-end languageThe MongoDB backend is implemented in C++ and the CouchDB is implemented in Erlang. So JavaScript is not used as the primary language for the backend for theses systems.From mongodb.com:Written in C++From couchdb.apache.com:CouchDB is written in Erlang, a robust functional programming language ideal for building concurrent distributed systems. Erlang allows for a flexible design that is easily scalable and readily extensible.