What does CADR mean in scheme?
Primitive definitions. car = first item cdr = second and all subsequent items in list cadr = second item. Cdr. Similar to the car primitive, cdr refers to the phrase “Contents of Decrement part of Register.” On the original hardware, this referred to the second and subsequent items in a list.
What is CDDR Lisp?
CDDR function is composition of two CDR functions. That is, (CDDR X) is same as (CDR (CDR X)). There are other CAR and CDR combinations, see HyperSpec, CAR and CDR.
Why is it called CAR and CDR?
car is an acronym from the phrase Contents of the Address part of the Register; and cdr is an acronym from the phrase Contents of the Decrement part of the Register. These phrases refer to specific pieces of hardware on the very early computer on which the Lisp language was developed.
What does CDR do?
The CDR of a list is the rest of the list, that is, the cdr function returns the part of the list that follows the first item. Like car , cdr does not remove any elements from the list—it just returns a report of what the second and subsequent elements are. Incidentally, in the example, the list of flowers is quoted.
How do you define a list in Scheme?
In contrast to Scheme’s unstructured data types, such as symbols and numbers, lists are structures that contain other values as elements. A list is an ordered collection of values. In Scheme, lists can be heterogeneous, in that they may contain different kinds of values.
What is let Scheme?
In Scheme, you can use local variables pretty much the way you do in most languages. When you enter a let expression, the let variables will be bound and initialized with values. When you exit the let expression, those bindings will disappear.
What does member do in LISP?
MEMBER function searches a list for the first occurrence of an element (item) satisfying the test. Return value is tail of the list starting from found element or NIL when item is not found. See also MEMBER-IF, POSITION, POSITION-IF, FIND and FIND-IF.
How do you pronounce car and CDR?
The origins of the names for car and cdr , on the other hand, are esoteric: car is an acronym from the phrase `Contents of the Address part of the Register’; and cdr (pronounced `could-er’) is an acronym from the phrase `Contents of the Decrement part of the Register’.
What is CDR in automotive?
CDR is the Acronym for “Crash Data Retrieval” CDR technicians and experts connect their EDR tool to an automobile allowing them to communicate with the vehicle and retrieve the EDR data file. Specialized software is then used to translate the EDR data file to a readable format for review and analysis.