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PO
primarykey
Id
13552248
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-11-25T15:05:53.100
FavoriteCount
0
LastActivityDate
2012-11-25T15:46:01.133
LastEditDate
2012-11-25T15:46:01.133
LastEditorUserId
201359
OwnerUserId
201359
ParentId
13550482
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
The first version in your code doesn't make much sense. Why use <code>lambda</code>s in this way? you're supposed to recursively call the same procedure being defined, not creating a one-shot anonymous procedure, that won't work for solving the problem at hand. And this part: <code>(list1)</code> is causing the error <code>The object is not applicable</code>: you're trying to invoke the list as if it were a procedure - because it's surrounded by parenthesis. Remember that in Scheme, a syntax such as this one: <code>(foo)</code> indicates that the <code>foo</code> procedure is to be called. The second version of your code is fine, that's the simple way to implement a <code>remove-all</code> procedure. A bit of nitpicking, though: when you find yourself nesting <code>if</code>s, it's a sure sign that a <code>cond</code> would be more appropriate. Also notice that it's a good idea to use <code>equal?</code> instead of <code>=</code>, in that way your procedure will work for more than just numbers: <pre><code>(define (rmobject list1 obj) (cond ((null? list1) '()) ((equal? obj (car list1)) (rmobject (cdr list1) obj)) (else (cons (car list1) (rmobject (cdr list1) obj))))) </code></pre> For future reference: the procedure you're implementing it's generally included as part of the interpreter. For example, in Racket we have <code>remove*</code>, which uses <code>equal?</code> as the default procedure for testing equality: <pre><code>(define (rmobject list1 obj) (remove* (list obj) list1)) </code></pre> Also, you can use <code>filter</code> as in @Maxwell's answer. Another way to write it: <pre><code>(define (rmobject list1 obj) (filter (negate (curry equal? obj)) list1)) </code></pre> Anyway, this works: <pre><code>(rmobject '(1 2 3 5 0 2 3 5 3) 3) => '(1 2 5 0 2 5) </code></pre>
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1. This table or related slice is empty.
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1. POremoving elements from a list in Scheme
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1. PTAnswer
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1. USÓscar López
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1. USÓscar López
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1. POremoving elements from a list in Scheme
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