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By returning a null object (i.e., an empty list) instead, there is no need to verify that the return value is in fact a list. The calling function may simply iterate the list as normal, effectively doing nothing. It is, however, still possible to check whether the return value is a null object (an empty list) and react differently if desired.
If the base register is also 0, the branch is not taken regardless of the value of the displacement register or displacement address. NOPR: 2 0x0700 or 0x070n or 0x07n0 where "n" is any 4-bit value. SuperH: NOP: 2 0x0009 MIPS: NOP: 4 0x00000000 Stands for sll r0,r0,0, meaning: Logically shift register 0 zero bits to the left and store the ...
Off-by-one errors are common in using the C library because it is not consistent with respect to whether one needs to subtract 1 byte – functions like fgets() and strncpy will never write past the length given them (fgets() subtracts 1 itself, and only retrieves (length − 1) bytes), whereas others, like strncat will write past the length given them.
In all versions of Python, boolean operators treat zero values or empty values such as "", 0, None, 0.0, [], and {} as false, while in general treating non-empty, non-zero values as true. The boolean values True and False were added to the language in Python 2.2.1 as constants (subclassed from 1 and 0 ) and were changed to be full blown ...
Folds can be regarded as consistently replacing the structural components of a data structure with functions and values. Lists, for example, are built up in many functional languages from two primitives: any list is either an empty list, commonly called nil ([]), or is constructed by prefixing an element in front of another list, creating what is called a cons node ( Cons(X1,Cons(X2,Cons ...
Common Lisp uses an empty list for false, and any other value for true. The C programming language uses an integer type, where relational expressions like i > j and logical expressions connected by && and || are defined to have value 1 if true and 0 if false, whereas the test parts of if, while, for, etc., treat any non-zero value as true.
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An empty list (), which is a special object usually called nil. A cons cell whose car is the first element of the list and whose cdr is a list containing the rest of the elements. This forms the basis of a simple, singly linked list structure whose contents can be manipulated with cons , car , and cdr .