Object.deep_extract (obj, props)

gistfile1.txt

Object.deep_extract =
    (obj, props) ->
        if props.length == 0
            obj
        else
            prop = props[0]
            if obj[prop]? then Object.deep_extract obj[prop], props[1..] else undefined

test_object = 
    1: 
        'key': 'value'
    2: 'b'
    3: 'c'

console.log Object.deep_extract test_object , ['1', 'key']
console.log Object.deep_extract test_object , ['some', 'other', 'key']

# Output:
# > value
# > undefined