Thanks,
But something is not going right.
When delete the if as you said and have this :
(defn boolean [x]
(or (false? x)(nil? x))
false;
true)
(defn abs [x]
(< x 0)
(* x -1);
x)
(defn teen? [age]
(< 12 age 20)
true;
false)
Then all tests fail and if I put a if before it , they all work well.
Roelof
Op woensdag 23 april 2014 12:19:01 UTC+2 schreef James Reeves:
> (< a b c) is equivalent to (and (< a b) (< b c)), so yes, (< 12 age 20) is
> the same as 12 < age < 20.
>
> You could write your function more concisely as:
>
> (defn teen? [age]
> (< 12 age 20))
>
> The "if" statement is unnecessary.
>
> - James
>
>
> On 23 April 2014 11:11, Roelof Wobben <rwo...@hotmail.com <javascript:>>wrote:
>
>> Hello,
>>
>> I do not understand why this work.
>>
>> I have to check if someone is between 12 and 20 years.
>>
>> So after some trail and error this seems to work
>>
>> (defn teen? [age]
>> (if (< 12 age 20)
>> true;
>> false))
>>
>> Is it right it stated 12 < age < 20 ?
>>
>> Roelof
>>
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