in CoffeeScript, how can I use a variable as a key in a hash?

coffeescript hashmap literals

Giles Bowkett · Oct 8, 2011 · Viewed 31.3k times · Source

eg:

wtf

So:

foo = "asdf"
{foo: "bar"}
eval foo

# how do I get {"asdf": "bar"} ?

# this will throw parse error:
{(eval foo): "bar"}

This is a simple syntax question: how do I get CoffeeScript to construct a hash dynamically, rather than doing it by hand?

Answer

For anyone that finds this question in the future, as of CoffeeScript 1.9.1 interpolated object literal keys are supported!

The syntax looks like this:

myObject =
  a: 1
  "#{ 1 + 2 }": 3