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--- status:
--- author(s):
--- notes:
doc ///
Node
Key
options
Headline
get options
SeeAlso
Option
Node
Key
Option
Headline
the class of all key-value pairs K => V
Description
Text
Such pairs are used as optional arguments for functions.
Example
o = Limit => 5
peek o
Text
There is also a way to make new @TO2{HashTable, "hash tables"}@ from lists of key-value pairs.
Example
ht = new HashTable from {a => 5, b => 7}
keys ht
values ht
pairs ht
Text
These pairs are implemented as lists, so that if {\tt z} is {\tt x => y},
then {\tt x} is {\tt z#0} and {\tt y} is {\tt z#1}.
Example
o#0
o#1
SeeAlso
(NewFromMethod, HashTable, List)
(symbol=>, Thing, Thing)
options
Node
Key
(options, Command)
(options, Function)
(options, Sequence)
(options, ZZ)
Headline
get optional arguments and default values of functions and methods
Usage
options f
Inputs
f:{Command,Function,Sequence,ZZ}
Outputs
:{OptionTable,Boolean}
Description
Text
The keys of the output are the names of the optional arguments accepted by
the function {\tt f} and the values are the corresponding default values;
or @TO "true"@, if the function accepts arbitrary options and provides no default values.
Example
options res
options codim
options(codim, Ideal)
methods intersect
options 0
SeeAlso
methods
///
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