On any given day I use any combination of the following languages: Ruby, Python, JavaScript, CoffeeScript, Haskell, Bash.
If I could remember how each language handled list operations and JSON/Base64 encoding I could probably code much faster, but the real efficiency gain wouldn't come until I stop reading HN :P
If I could remember how each language handled list operations and JSON/Base64 encoding I could probably code much faster, but the real efficiency gain wouldn't come until I stop reading HN :P