Question

I have an array of values in Coffeescript such that:

arr = ['key1': 1, 'key2': 2, 'key3': 3]

I want to transform this array into an array of just values. Basically,

arr.map (iter) -> iter.value  # arr => [1,2,3]

=> []

I’ve attempted several permutations of this, but I just keep getting back an empty array. Any tips?

Answer 1

This is a CoffeeScript question and the sample code is valid CoffeeScript

arr = ['key1': 1, 'key2': 2, 'key3': 3]

translates to the following JavaScript:

var arr;
arr = [
  {
    'key1': 1,
    'key2': 2,
    'key3': 3
  }
];

Firstly, you have to realize that

obj = 
  key1: 1 
  key2: 2
  key3: 3

is most likely what you want.

Then you can use the following code to create an array with only the values of the object.

arr = null
arr.push val for key, val of obj

Update

This one-liner from ‘mu is too short’ is even better.

arr = (val for key, val of obj)