common lisp not null

In Common Lisp, if I wanted to check whether a list was not null, I could s...

In Common Lisp, if I wanted to check whether a list was not null, I could simply use the list itself as the condition, since all non-nil lists are.

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Apart from that, there is also a predicate function called null that you mi...

Apart from that, there is also a predicate function called null that you might use. Do you want to check if the variable is nil or if it is not nil?

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Common Lisp provides three operators on Boolean values: and, or, and not. u...

Common Lisp provides three operators on Boolean values: and, or, and not. use null to check whether something is the empty list and to use not to invert the.

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In Common Lisp, as in most Lisp dialects, the symbol nil is used to represe...

In Common Lisp, as in most Lisp dialects, the symbol nil is used to represent to be recognized not as the symbol that represents the empty list but as another.

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Kenny's point is that to test for a not null list you can just write l...

Kenny's point is that to test for a not null list you can just write list. like: Common Lisp: A Gentle Introduction to Symbolic Computation.

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NULL function returns true if the argument is NIL, otherwise it returns fal...

NULL function returns true if the argument is NIL, otherwise it returns false. NULL is identical to NOT, but used in conjunction with list processing unlike NOT.

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Use NULL. Kenny's point is that to test for a not null list you can ju...

Use NULL. Kenny's point is that to test for a not null list you can just write list. Common Lisp: A Gentle Introduction to Symbolic Computation.

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if refR = null then write("refR is null") else write("not nu...

if refR = null then write("refR is null") else write("not null"); end. .. (InterLisp had other liberties that do not survive into Common Lisp: it was.

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The predicate function null returns t if the parameter is nil, and returns ...

The predicate function null returns t if the parameter is nil, and returns nil otherwise. It evaluates the first parameter; if it returns a non-nil value, it evaluates and returns the Using the full Common Lisp language a simpler way is to write.

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The type nil contains no objects and so is also called the empty type. The ...

The type nil contains no objects and so is also called the empty type. The type nil is a Notes: The type containing the object nil is the type null, not the type nil.

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A Lisp list is not really terminated with an empty list -- it's termin...

A Lisp list is not really terminated with an empty list -- it's terminated with a special null pointer as you can get (in C, a null pointer constant is an integer constant equal . Common Lisp uses a symbol object: the symbol nil.

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As a general response, Emacs Lisp treats all non- nil values as true for Th...

As a general response, Emacs Lisp treats all non- nil values as true for This function is identical to not, but as a matter of clarity we use null.

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Common Lisp was not the first attempt at a universal Lisp dialect, but it w...

Common Lisp was not the first attempt at a universal Lisp dialect, but it was more For example, Common Lisp's version of the null? predicate is just " null," not.

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In Lisp, functions can gracefully accept the special object nil, which For ...

In Lisp, functions can gracefully accept the special object nil, which For instance, although nil is an atom and does not have any.

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There is a notion of priority, and we do not need more parentheses than in ...

There is a notion of priority, and we do not need more parentheses than in any (lisp-func prio) (make-trigger:prio prio:func (lambda (result f) (if (null f) (error.

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