Querying an array of objects

Question

Anyone have guidance on how to query an array of hashes in coffeescript?

For example, I have an array of hashes, each with a "name" and "setting":

[
  {"name":"color", "setting":"red"},
  {"name":"scale_min", "setting":"15"},
  {"name":"scale_type", "setting":"linear"},
  {"name":"x_axis_label", "setting":"Weeks"}
]

I want to find the element in this array where the hash "name" is "x_axis_label"

How can I easily do that with coffeescript?

I need some kind of value_for_key_in_object(key, object) function and figured if would be part of the lexicon...

Answer 1

If you going to do this repeatedly, always looking for things where the name equals something, then you are better off converting this from an array of maps to just a map where the key is the name.

data = [
  {"name":"color","setting":"red"}
  {"name":"scale_min","setting":"15"}
  {"name":"scale_type","setting":"linear"}
  {"name":"x_axis_label","setting":"Weeks"}
]

myMap = {}
for row in data
  myMap[row.name] = row.setting

alert(myMap['x_axis_label'])

Demo

Answer 2

I just hacked this up quickly:

data = [{"name":"color","setting":"red"},{"name":"scale_min","setting":"15"},{"name":"scale_type","setting":"linear"},{"name":"x_axis_label","setting":"Weeks"}]

find = (i for i in data when i.name is 'x_axis_label')[0]

alert(find.setting)

Demo