CoffeeScript loop through methods

Question

I have an object literal that I'm using to group methods. I'd like to be able to call a whole group of methods easily, like so:

group =
  methodA: (str) ->
    console.log str + "from method A"

  methodB: (str) ->
    console.log str + "from method B"

for method in group
  method "hello"

# should log to console:
# "hello from method A"
# "hello from method B"

When I try this it doesn't seem to work. What am I missing / how should you go about looping through a group of methods like this?

Sean Vieira · Accepted Answer · 2012-09-04 04:27:09Z

1

for ... in compiles down to a for loop that assumes you are looping over an array - use for own ... of instead:

group =
  methodA: (str) ->
    console.log str + "from method A"

  methodB: (str) ->
    console.log str + "from method B"

for own method of group
  group[method] "hello"

edited Sep 4, 2012 at 4:27

answered Sep 4, 2012 at 4:21

Sean Vieira

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3 Comments

Andrew Over a year ago

Getting TypeError: method is not a function. If I just do console.log method in the for loop it prints methodA, methodB

Sean Vieira Over a year ago

Mea culpa @Andrew - I've fixed it (for ... of enumerates keys not values).

Andrew Over a year ago

Ah, I get it. I didn't realize you could call a method like you were accessing a hash property, but of course that's all it is, so why not! Thanks!

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