Reflection/List properties: Difference between revisions

{{task|Reflection}} [[Category:Programming Tasks]] [[Category:Object oriented]]

 

;Task:

=={{header|C sharp}}==

{{works with|C sharp|7}}

using System.Collections.Generic;

using System.Linq;

}

 

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</pre>

 

 

class MyClass

{

}

 

{

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=={{header|Factor}}==

 

TUPLE: foo

 

"apple" "banana" 200 <foo> <mirror>

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=={{header|Go}}==

 

import (

}

fmt.Println()

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Y int true

</pre>

 

=={{header|Java}}==

 

public class ListFields {

}

}

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There are multiple ways of getting property names, each of which include different subsets of an object's properties, such as enumerable or inherited properties. Properties in JavaScript can be enumerable or non-enumerable; enumerable properties are accessable when looping over the object with <code>for</code>. <code>Object.getOwnPropertyNames()</code>.

 

name: 'proto',

proto: true,

Object.entries(obj);

//[["name", "obj"], ["obj", true], ["doStuff", function()]]

 

=={{header|Julia}}==

{{works with|Julia|0.6}}

 

println("\nObject: $obj\nDescription:")

dump(obj)

 

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=={{header|Kotlin}}==

 

import kotlin.reflect.full.memberProperties

println("${prop.name.padEnd(13)} -> ${prop.get(example)}")

}

 

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=={{header|Lingo}}==

obj.foo = 23

obj.bar = 42

repeat with i = 1 to cnt

put obj.getPropAt(i)&" = "&obj[i]

 

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-- "foo = 23"

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=={{header|Objective-C}}==

#import <objc/runtime.h>

 

 

return 0;

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}

 

 

 

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=={{header|PHP}}==

class Foo {

}

 

var_dump(get_object_vars($obj));

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}

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=={{header|PL/I}}==

 

Here we find the properties of a <code>[DateTime]</code> object:

Get-Date | Get-Member -MemberType Property

 

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The "Add" methods of a <code>[DateTime]</code> object:

Get-Date | Get-Member -MemberType Method -Name Add*

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The <code>[https://docs.python.org/3.5/library/functions.html#dir dir()]</code> function and Python's <code>[https://docs.python.org/3.5/library/inspect.html#module-inspect inspect]</code> module both will list properties.

 

__priv = 'private'

inspect.getmembers(chld)

#[('__class__', <class '__main__.Child'>), ..., ('args', (0, 'I', 'two')), ('args_bleh', "(0, 'I', 'two') bleh"), ('doNothing', <bound method Child.doNothing of Child(chld, 0, 'I', 'two')>), ('doStuff', <bound method Child.doStuff of Child(chld, 0, 'I', 'two')>), ('name', 'chld'), ('name_bleh', 'chld bleh'), ('own', "chld's own"), ('own_bleh', "chld's own bleh"), ('reBleh', <_sre.SRE_Pattern object at 0x10067bd20>), ('reBleh_bleh', '<_sre.SRE_Pattern object at 0x10067bd20> bleh')]

 

=={{header|REXX}}==

(This REXX version is modeled after the &nbsp; '''PL/I''' &nbsp; entry.)

 

 

A simplistic example:

abc.j= -4.12

 

 

<br><br>

 

=={{header|Ruby}}==

@@xyz = nil

def initialize(name, age)

p Foo.class_variable_get(:@@xyz) #=> :xyz

p Foo.class_variable_set(:@@abc, 123) #=> 123

 

=={{header|Scala}}==

===Java Interoperability===

{{Out}}Best seen running in your browser [https://scastie.scala-lang.org/MdkPxH6yTlS4W8TaXYxSgA Scastie (remote JVM)].

private val obj = new {

val examplePublicField: Int = 42

println("\nAll declared fields (excluding inherited):")

clazz.getDeclaredFields.foreach(f => println(s"${f}}"))

 

=={{header|Tcl}}==

 

For objects supporting this protocol, you can list all options by invoking the <tt>configure</tt> method without arguments (result split over multiple lines for readability):

8.6.5

% . configure

{-highlightcolor highlightColor HighlightColor #000000 #000000}

{-highlightthickness highlightThickness HighlightThickness 0 0} {-padx padX Pad 0 0} {-pady padY Pad 0 0}

 

Two-element sublists (eg <tt>-bd -borderwidth</tt>) represent aliases, and five-element sublists are of the form <tt>{optionName dbName dbClass defaultValue currentValue}</tt>. <tt>dbName</tt> and <tt>dbClass</tt> are related to how the option is specified in the <i>option database</i>.

Simply listing the option names is like this:

 

-borderwidth -class -menu -relief -screen -use -background -colormap -container -cursor -height

 

=={{header|zkl}}==

 

Every object has a "properties" method, which returns a list of property names [for that object].

properties.println();

List(1,2,3).property(properties[0]).println(); // get value

List(1,2,3).Property(properties[0])().println(); // method that gets value

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