How to access record in a hashmap
When you have:
(def object-locations {
'whiskey 'living-room
'bucket'living-room
'chain 'garden
'frog 'garden
'dummy 'nowhere
'test 'nowhere
})
You can retrieve the location of the bucket with:
(object-locations 'bucket)
and with:
('bucket object-locations)
Personally I find the first better, but ‘Clojure Programming' uses the
second possibility. What is the better way and why?
--
Cecil Westerhof
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Re: How to access record in a hashmap
Short and simple answer: NullPointerException
(def object-locations nil)
(object-locations 'bucket) will throw
('bucket object-locations) = nil
HTH,
/thomas
On Wednesday, July 9, 2014 3:48:53 PM UTC+2, Cecil Westerhof wrote:
When you have:
(def object-locations {
'whiskey 'living-room
'bucket'living-room
'chain 'garden
'frog 'garden
'dummy 'nowhere
'test 'nowhere
})
You can retrieve the location of the bucket with:
(object-locations 'bucket)
and with:
('bucket object-locations)
Personally I find the first better, but ‘Clojure Programming' uses the
second possibility. What is the better way and why?
--
Cecil Westerhof
--
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Re: How to access record in a hashmap
Oh and its rare (outside of macros) to use symbols like that. Usually you'd
use keywords.
(def object-locations
{:whiskey :living-room})
On Wed, Jul 9, 2014 at 5:03 PM, Thomas Heller th.hel...@gmail.com wrote:
Short and simple answer: NullPointerException
(def object-locations nil)
(object-locations 'bucket) will throw
('bucket object-locations) = nil
HTH,
/thomas
On Wednesday, July 9, 2014 3:48:53 PM UTC+2, Cecil Westerhof wrote:
When you have:
(def object-locations {
'whiskey 'living-room
'bucket'living-room
'chain 'garden
'frog 'garden
'dummy 'nowhere
'test 'nowhere
})
You can retrieve the location of the bucket with:
(object-locations 'bucket)
and with:
('bucket object-locations)
Personally I find the first better, but ‘Clojure Programming' uses the
second possibility. What is the better way and why?
--
Cecil Westerhof
--
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Re: How to access record in a hashmap
2014-07-09 17:03 GMT+02:00 Thomas Heller th.hel...@gmail.com:
Short and simple answer: NullPointerException
(def object-locations nil)
(object-locations 'bucket) will throw
('bucket object-locations) = nil
That is interesting.
Not a problem, because it will never be nil, but always a HashMap. But
better save as sorry. I will change it.
On Wednesday, July 9, 2014 3:48:53 PM UTC+2, Cecil Westerhof wrote:
When you have:
(def object-locations {
'whiskey 'living-room
'bucket'living-room
'chain 'garden
'frog 'garden
'dummy 'nowhere
'test 'nowhere
})
You can retrieve the location of the bucket with:
(object-locations 'bucket)
and with:
('bucket object-locations)
Personally I find the first better, but ‘Clojure Programming' uses the
second possibility. What is the better way and why?
--
Cecil Westerhof
--
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Re: How to access record in a hashmap
2014-07-09 17:18 GMT+02:00 Thomas Heller th.hel...@gmail.com:
Oh and its rare (outside of macros) to use symbols like that. Usually
you'd use keywords.
(def object-locations
{:whiskey :living-room})
It is from 'Land of Lisp'. The symbols are printed. Or is it possible to
print the keyword without the :?
On Wed, Jul 9, 2014 at 5:03 PM, Thomas Heller th.hel...@gmail.com wrote:
Short and simple answer: NullPointerException
(def object-locations nil)
(object-locations 'bucket) will throw
('bucket object-locations) = nil
HTH,
/thomas
On Wednesday, July 9, 2014 3:48:53 PM UTC+2, Cecil Westerhof wrote:
When you have:
(def object-locations {
'whiskey 'living-room
'bucket'living-room
'chain 'garden
'frog 'garden
'dummy 'nowhere
'test 'nowhere
})
You can retrieve the location of the bucket with:
(object-locations 'bucket)
and with:
('bucket object-locations)
Personally I find the first better, but ‘Clojure Programming' uses the
second possibility. What is the better way and why?
--
Cecil Westerhof
--
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Re: How to access record in a hashmap
(name :foo)
will return the name as a string
(symbol (name :foo))
Converts the name of the keyword to a symbol
On Wed, Jul 9, 2014 at 9:28 AM, Cecil Westerhof cldwester...@gmail.com
wrote:
2014-07-09 17:18 GMT+02:00 Thomas Heller th.hel...@gmail.com:
Oh and its rare (outside of macros) to use symbols like that. Usually
you'd use keywords.
(def object-locations
{:whiskey :living-room})
It is from 'Land of Lisp'. The symbols are printed. Or is it possible to
print the keyword without the :?
On Wed, Jul 9, 2014 at 5:03 PM, Thomas Heller th.hel...@gmail.com
wrote:
Short and simple answer: NullPointerException
(def object-locations nil)
(object-locations 'bucket) will throw
('bucket object-locations) = nil
HTH,
/thomas
On Wednesday, July 9, 2014 3:48:53 PM UTC+2, Cecil Westerhof wrote:
When you have:
(def object-locations {
'whiskey 'living-room
'bucket'living-room
'chain 'garden
'frog 'garden
'dummy 'nowhere
'test 'nowhere
})
You can retrieve the location of the bucket with:
(object-locations 'bucket)
and with:
('bucket object-locations)
Personally I find the first better, but ‘Clojure Programming' uses the
second possibility. What is the better way and why?
--
Cecil Westerhof
--
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“One of the main causes of the fall of the Roman Empire was that–lacking
zero–they had no way to indicate successful termination of their C
programs.”
(Robert Firth)
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Re: How to access record in a hashmap
Don't know Land of Lisp, but if you print it you can use (name :whiskey) to
get whiskey (as a String), also works on (name 'whiskey).
On Wed, Jul 9, 2014 at 5:28 PM, Cecil Westerhof cldwester...@gmail.com
wrote:
2014-07-09 17:18 GMT+02:00 Thomas Heller th.hel...@gmail.com:
Oh and its rare (outside of macros) to use symbols like that. Usually
you'd use keywords.
(def object-locations
{:whiskey :living-room})
It is from 'Land of Lisp'. The symbols are printed. Or is it possible to
print the keyword without the :?
On Wed, Jul 9, 2014 at 5:03 PM, Thomas Heller th.hel...@gmail.com
wrote:
Short and simple answer: NullPointerException
(def object-locations nil)
(object-locations 'bucket) will throw
('bucket object-locations) = nil
HTH,
/thomas
On Wednesday, July 9, 2014 3:48:53 PM UTC+2, Cecil Westerhof wrote:
When you have:
(def object-locations {
'whiskey 'living-room
'bucket'living-room
'chain 'garden
'frog 'garden
'dummy 'nowhere
'test 'nowhere
})
You can retrieve the location of the bucket with:
(object-locations 'bucket)
and with:
('bucket object-locations)
Personally I find the first better, but ‘Clojure Programming' uses the
second possibility. What is the better way and why?
--
Cecil Westerhof
--
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Re: How to access record in a hashmap
2014-07-09 17:32 GMT+02:00 Timothy Baldridge tbaldri...@gmail.com:
(name :foo)
will return the name as a string
(symbol (name :foo))
Converts the name of the keyword to a symbol
It is not even necessary. I changed to keywords. The code uses:
`(You see a ~obj on the floor.)
And it is displayed as:
You see a whiskey on the floor.
You see a bucket on the floor.
Maybe it does not work in all cases: so I need to do some testing.
Let change the rest also to keywords.
On Wed, Jul 9, 2014 at 9:28 AM, Cecil Westerhof cldwester...@gmail.com
wrote:
2014-07-09 17:18 GMT+02:00 Thomas Heller th.hel...@gmail.com:
Oh and its rare (outside of macros) to use symbols like that. Usually
you'd use keywords.
(def object-locations
{:whiskey :living-room})
It is from 'Land of Lisp'. The symbols are printed. Or is it possible to
print the keyword without the :?
On Wed, Jul 9, 2014 at 5:03 PM, Thomas Heller th.hel...@gmail.com
wrote:
Short and simple answer: NullPointerException
(def object-locations nil)
(object-locations 'bucket) will throw
('bucket object-locations) = nil
HTH,
/thomas
On Wednesday, July 9, 2014 3:48:53 PM UTC+2, Cecil Westerhof wrote:
When you have:
(def object-locations {
'whiskey 'living-room
'bucket'living-room
'chain 'garden
'frog 'garden
'dummy 'nowhere
'test 'nowhere
})
You can retrieve the location of the bucket with:
(object-locations 'bucket)
and with:
('bucket object-locations)
Personally I find the first better, but ‘Clojure Programming' uses the
second possibility. What is the better way and why?
--
Cecil Westerhof
--
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Re: How to access record in a hashmap
2014-07-09 17:50 GMT+02:00 Cecil Westerhof cldwester...@gmail.com:
2014-07-09 17:32 GMT+02:00 Timothy Baldridge tbaldri...@gmail.com:
(name :foo)
will return the name as a string
(symbol (name :foo))
Converts the name of the keyword to a symbol
It is not even necessary. I changed to keywords. The code uses:
`(You see a ~obj on the floor.)
And it is displayed as:
You see a whiskey on the floor.
You see a bucket on the floor.
Maybe it does not work in all cases: so I need to do some testing.
Let change the rest also to keywords.
It seems to work. The only 'problem' is that I
need to use:
(pickup :bucket)
instead of:
(pickup 'bucket)
But that is only temporary, because there will be an optimisation later on.
On Wed, Jul 9, 2014 at 9:28 AM, Cecil Westerhof cldwester...@gmail.com
wrote:
2014-07-09 17:18 GMT+02:00 Thomas Heller th.hel...@gmail.com:
Oh and its rare (outside of macros) to use symbols like that. Usually
you'd use keywords.
(def object-locations
{:whiskey :living-room})
It is from 'Land of Lisp'. The symbols are printed. Or is it possible
to print the keyword without the :?
On Wed, Jul 9, 2014 at 5:03 PM, Thomas Heller th.hel...@gmail.com
wrote:
Short and simple answer: NullPointerException
(def object-locations nil)
(object-locations 'bucket) will throw
('bucket object-locations) = nil
HTH,
/thomas
On Wednesday, July 9, 2014 3:48:53 PM UTC+2, Cecil Westerhof wrote:
When you have:
(def object-locations {
'whiskey 'living-room
'bucket'living-room
'chain 'garden
'frog 'garden
'dummy 'nowhere
'test 'nowhere
})
You can retrieve the location of the bucket with:
(object-locations 'bucket)
and with:
('bucket object-locations)
Personally I find the first better, but ‘Clojure Programming' uses
the second possibility. What is the better way and why?
--
Cecil Westerhof
--
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