Cons vs Null - What's the difference?
cons | null |
(computing) A data structure in LISP that is a pair of pointers, car and cdr, used mainly for lists.
(computing) To obtain a list from a cons or a nesting of conses; to prepend an element to a list by forming a cons of that element and the list; to obtain a list from a smaller one by repeated application of such kind of prepending.
(con)
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A non-existent or empty value or set of values.
Zero]] quantity of [[expression, expressions; nothing.
Something that has no force or meaning.
(computing) the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator.
(computing) the attribute of an entity that has no valid value.
One of the beads in nulled work.
(statistics) null hypothesis
Having no validity, "null and void"
insignificant
* 1924 , Marcel Proust, Within a Budding Grove :
absent or non-existent
(mathematics) of the null set
(mathematics) of or comprising a value of precisely zero
(genetics, of a mutation) causing a complete loss of gene function, amorphic.
As nouns the difference between cons and null
is that cons is or cons can be (computing) a data structure in lisp that is a pair of pointers, car and cdr, used mainly for lists while null is zero, nil; the cardinal number before einn.As a verb cons
is (computing) to obtain a list from a cons or a nesting of conses; to prepend an element to a list by forming a cons of that element and the list; to obtain a list from a smaller one by repeated application of such kind of prepending or cons can be (con).cons
English
Etymology 1
Noun
(head)Etymology 2
Abbreviation of construct .Noun
(conses)Synonyms
* cons cellVerb
(es)- In addition to specifying the whole list at once using square brackets and commas, you can build them up piece by piece using the (:) operator. This process is often referred to as consing.
Etymology 3
Verb
(head)null
English
Noun
(en noun)- (Francis Bacon)
- Since no date of birth was entered for the patient, his age is null .
Adjective
(en adjective)- In proportion as we descend the social scale our snobbishness fastens on to mere nothings which are perhaps no more null than the distinctions observed by the aristocracy, but, being more obscure, more peculiar to the individual, take us more by surprise.