Standards for mixing languages within one application? [duplicate]

Question

Possible Duplicate:
What do you do when working with multiple languages with different capitalization schemes?

When mixing programming languages, is it a best practice to use different standard conventions for different languages?

The standard naming convention for variables and functions in Ruby uses underscores: new_date.

In JavaScript it is CamelCase: newDate.

Would you use both conventions within the same app? Does it get confusing remembering which convention goes with which language?

By the way, the naming example above is just one or many conventions. Others include formatting, etc.

Answer 1

Personally I follow the naming conventions of whatever language I'm currently using. So in the OP's example yes I would write Ruby in_ruby_style and write Javascript inJavascriptStyle. Following the conventions of the language makes it easier to follow the code in that language.

Answer 2

If the different languages use different conventions, it is easier to see what context one is in.

For example - if you mix JavaScript and C#, if you using the same brace position, variable name casing and other coding standards, it can be very confusing to remember whether one is looking at C# or JavaScript and adjust your thinking to the correct one.

I don't believe there is a standard as such, but common sense dictates that you should use different coding styles (and try to keep to the idiomatic ones) per each language.