Editing Yhc/Javascript/Brief overview (section)

==Principles of Operation==
The Yhc compiler generally produces a binary [[Yhc/RTS/hbc|bytecode]] file (usually named with ''.hbc'' extension) for each Haskell module compiled. These bytecode files are to be interpreted by [[Yhc/Tutorial#yhi|yhi]], a command-line bytecode interpreter.

The compiler is also capable of producing a binary [[Yhc/API/Core|core]] file (usually named with ''.ycr'' extension), and also its human-readable representation for each Haskell module compiled. The internal structure of core is based on significantly simplified nhc98's PosLambda constructs (Yhc is derived from nhc98 code). Core consists of definitions for compiled Haskell functions and data objects.

The feature of core linking was added recently to Yhc. This allows for merging core files from several modules together, removing functions that are not used (similar to static linking performed by a traditional Unix or Windows executable linker). The resulting file (usually named with ''.yca'' extension) has the same format as per-module core files.

Binary core files may be read back into computer memory using the [http://www.cs.york.ac.uk/fp/yhc/snapshot/docs/Yhc-Core.html Yhc Core API] functions.

The '''ycr2js''' program reads the binary core file specified (.yca or .ycr), and performs conversion of Haskell functions compiled into Core to their Javascript representation storing the generated Javascript code in a file. Resulting Javascript may be embedded on a (X)HTML page to be loaded into a Web browser.