带有字典对象/数组的CoffeeScript RegEx ListComprehension

Question

Code

list = {}
list['blubber'] = 'it blubbers'
list['Bearmattazz'] = 'Honey'
document.write list.blubber

result = (item for item in list when item.match(/(mattazz)/g))
document.write '<br>Res: ', result

Pen

http://codepen.io/anon/pen/OVrwKO

Want

I want to regEx for mattazz , eg retrieve the value "Honey", in case mattazz key is in list .

Answer 1

You are trying to iterate through an object , but your coffee syntax is for array iteration . You need the of keyword for that. (See Coffescript.org: Loops and Comprehensions )

list is an object (as in key, value store), so you want to use key, value of list :

list = {}
list['Bearmattazz'] = 'Honey'

# in case you want to retrieve value
#
result = (value for key, value of list when key.match(/(mattazz)/g))

# in case you want to retrieve key
#
result = (key for key, value of list when key.match(/(mattazz)/g))

document.write '<br>Res: ', result