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Parameter names can be specified for both optional and required parameters, and can be used to improve readability or arbitrarily reorder arguments in a call. For example: Stream OpenFile ( string name , FileMode mode = FileMode .
Node.js programs are invoked by running the interpreter node interpreter with a given file, so the first two arguments will be node and the name of the JavaScript source file. It is often useful to extract the rest of the arguments by slicing a sub-array from process.argv .
C# 4.0 introduces optional parameters with default values as seen in Visual Basic and C++. For example: For example: void Increment ( ref int x , int dx = 1 ) { x += dx ; } int x = 0 ; Increment ( ref x ); // dx takes the default value of 1, after the method returns x == 1 Increment ( ref x , 2 ); // dx takes the value 2, after the method ...
Without named parameters, optional parameters can only appear at the end of the parameter list, since there is no other way to determine which values have been omitted. In languages that support named optional parameters, however, programs may supply any subset of the available parameters, and the names are used to determine which values have ...
In computer programming, a usage message or help message is a brief message displayed by a program that utilizes a command-line interface for execution. This message usually consists of the correct command line usage for the program and includes a list of the correct command-line arguments or options acceptable to said program.
An output parameter, also known as an out parameter or return parameter, is a parameter used for output, rather than the more usual use for input. Using call by reference parameters, or call by value parameters where the value is a reference, as output parameters is an idiom in some languages, notably C and C++, [ b ] while other languages have ...
Binary Property List file 42 5A 68: BZh: 0 bz2 Compressed file using Bzip2 algorithm 47 49 46 38 37 61 47 49 46 38 39 61: GIF87a GIF89a: 0 gif Image file encoded in the Graphics Interchange Format (GIF) [9] 49 49 2A 00 (little-endian) II*␀ 0 tif tiff Tagged Image File Format (TIFF) [10] 4D 4D 00 2A (big-endian) MM␀* 49 49 2B 00 (little ...
Introduced in Python 2.2 as an optional feature and finalized in version 2.3, generators are Python's mechanism for lazy evaluation of a function that would otherwise return a space-prohibitive or computationally intensive list. This is an example to lazily generate the prime numbers: