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Pretty sure he meant CoffeeScript. It doesn't remove mutability, but it does do away with default-global variables.

• masklinn 13y ago
  So does javascript unless you forget `var` and you refuse to `"use strict"` and lint.
  • steveklabnik 13y ago
    That's not really 'by default' then, eh?
    • masklinn 13y ago
      True, it's not the language's default, just the default your environment should have (and the default of any sane IDE). Which is less work than adding coffeescript to your toolchain.
    • kaonashi 13y ago
      The 'default' (and I'm not sure how now declaring your variables with var qualifies) depends entirely on what's bound to 'this'.