What is ScriptCraft?: http://scriptcraftjs.org/

ScriptCraft is a Minecraft Mod that lets you extend Minecraft using the Javascript Programming Language. ScriptCraft makes modding Minecraft easier. It includes a logo-like “Drone” object that can be used to build complex buildings, roads, villages, even entire cities. It also includes many other features that make modding Minecraft easier.

JavaScript Comes to Minecraft: http://www.i-programmer.info/news/167-javascript/5359-javascript-comes-to-minecraft.html

 
Build Giant Ravine in Minecraft using ScriptCraft (With Other Examples): http://www.codeproject.com/Articles/878585/Build-Giant-Ravine-in-Minecraft-using-ScriptCraft