basic quoting question
user= (X Y)
ClassCastException java.lang.String cannot be cast to clojure.lang.IFn
user/eval116 (NO_SOURCE_FILE:32)
user= '(X Y)
(X Y)
user= ['X 'Y]
[X Y]
user= '[X Y]
[X Y]
user= ('X 'Y)
nil
All of these are as I expected except the last, which I thought would throw
something like the 1st case. What's going on there?
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Re: basic quoting question
symbol, 'X in the last case, implements IFn, and you're calling it
with the symbol 'Y as an argument.
On Mon, Oct 8, 2012 at 9:43 AM, Brian Craft craft.br...@gmail.com wrote:
user= (X Y)
ClassCastException java.lang.String cannot be cast to clojure.lang.IFn
user/eval116 (NO_SOURCE_FILE:32)
user= '(X Y)
(X Y)
user= ['X 'Y]
[X Y]
user= '[X Y]
[X Y]
user= ('X 'Y)
nil
All of these are as I expected except the last, which I thought would throw
something like the 1st case. What's going on there?
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Re: basic quoting question
user= ('X 'Y)
nil
All of these are as I expected except the last, which I thought would throw
something like the 1st case. What's going on there?
You've prevented X from being evaluated (it will be seen as the symbol
X), but you haven't prevented evaluation of the function call. Symbols
happen to be functions that look themselves up in collections. 'Y is
not a collection, so it returns nil.
Had you had something else in function position that wasn't actually a
valid function, you would have gotten a ClassCastException.
jack.
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Re: basic quoting question
Thanks!
Is the string vs symbol distinction peculiar to clojure, among lisps?
On Monday, October 8, 2012 8:03:00 AM UTC-7, Jack Moffitt wrote:
user= ('X 'Y)
nil
All of these are as I expected except the last, which I thought would
throw
something like the 1st case. What's going on there?
You've prevented X from being evaluated (it will be seen as the symbol
X), but you haven't prevented evaluation of the function call. Symbols
happen to be functions that look themselves up in collections. 'Y is
not a collection, so it returns nil.
Had you had something else in function position that wasn't actually a
valid function, you would have gotten a ClassCastException.
jack.
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Re: basic quoting question
On Mon, Oct 8, 2012 at 5:06 PM, Brian Craft craft.br...@gmail.com wrote:
Thanks!
Is the string vs symbol distinction peculiar to clojure, among lisps?
Yes, strings are distinct from symbols in every reputable lisp.
That symbol and keyword know how to look themselves up in an
associative collection is, as far as i know, unique to Clojure.
// Ben
On Monday, October 8, 2012 8:03:00 AM UTC-7, Jack Moffitt wrote:
user= ('X 'Y)
nil
All of these are as I expected except the last, which I thought would
throw
something like the 1st case. What's going on there?
You've prevented X from being evaluated (it will be seen as the symbol
X), but you haven't prevented evaluation of the function call. Symbols
happen to be functions that look themselves up in collections. 'Y is
not a collection, so it returns nil.
Had you had something else in function position that wasn't actually a
valid function, you would have gotten a ClassCastException.
jack.
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