Enum is a javascript module that introduces the Enum Type. It works for node.js and in the browser.
...and ref compatible Known Types
Releases for a browser are available for download from GitHub.
| Version | Description | Size |
|---|---|---|
enum-2.4.0.js |
uncompressed, with comments | Download |
enum-2.4.0.min.js |
compressed, without comments | Download |
$ npm install enum
<script src="enum.js"></script>
// use it as module
var Enum = require('enum');
// or extend node.js with this new type
require('enum').register();
// define a simple enum (automatically flaggable -> A: 0x01, B: 0x02, C: 0x04)
//Uses bitwise 'OR' operation in between the values and creates enumerated constants. For example, if 'Read':1, 'Write':2, then ReadWrite= Read | Write = 1 | 2 = 3;
var myEnum = new Enum(['A', 'B', 'C']);
//define a flagged enum object to create a multicolor option; just pass an array
var myEnum = new Enum(['Black', 'Red', 'Green', 'Blue']);
myEnum; //=> Enum {_options: Object, enums: Array[4], Black: EnumItem, Red: EnumItem, Green: EnumItem….....}
myEnum.isFlaggable; //=> true
for(var i=1; i<8; i++){ console.log(myEnum.get(i).value + '=> '+ myEnum.get(i).key)}
1=> Black
2=> Red
3=> Black | Red
4=> Green
5=> Black | Green
6=> Red | Green
7=> Black | Red | Green
// define an enum with own values
var myEnum = new Enum({'A': 1, 'B': 2, 'C': 4});
// if defining a flaggable enum, you can define your own separator (default is ' | ')
var myEnum = new Enum(['A', 'B', 'C'], { separator: ' | ' });
// if you want your enum to have a name define it in the options
var myEnum = new Enum(['A', 'B', 'C'], { name: 'MyEnum' });
// or
var myEnum = new Enum(['A', 'B', 'C'], 'MyEnum');
// if you want your enum to have an explicit "endianness", define it in the options
// (defaults to `os.endianness()`)
var myEnum = new Enum(['A', 'B', 'C'], { endianness: 'BE' });
// if you want your enum to be not case sensitive
// (defaults to `false`)
var myEnum = new Enum(['One', 'tWo', 'ThrEE'], { ignoreCase: true });
myEnum.get('one'); // => myEnum.One
myEnum.get('TWO'); // => myEnum.tWo
myEnum.ThrEE.is('three'); // => true
// this option will make instances of Enum non-extensible
// (defaults to `false`)
var myEnum = new Enum(['ONE', 'TWO', 'THREE'], { freez: true });
//define enum type without flag
var myEnum = new Enum({'None': 0, 'Black':1, 'Red': 2, 'Red2': 3, 'Green': 4, 'Blue': 5});
myEnum; //=> Enum {_options: Object, enums: Array[6], None: EnumItem, Black: EnumItem, Red: EnumItem…........}
myEnum.isFlaggable; //=> false
myEnum.toJSON(); // returns {'None': 0, 'Black':1, 'Red': 2, 'Red2': 3, 'Green': 4, 'Blue': 5}
JSON.stringify(myEnum); // returns '{"None":0,"Black":1,"Red":2,"Red2":3,"Green":4,"Blue":5}'
for(var i=0; i<=5; i++){ console.log(myEnum.get(i).value + '=> '+ myEnum.get(i).key)}
0=> None
1=> Black
2=> Red
3=> Red2
4=> Green
5=> Blue
// iterating over an enum
myEnum.enums.forEach(function(enumItem) {
console.log(enumItem.key);
});
// => None
// => Black
// => Red
// => Red2
// => Green
// => Blue
// get your item
myEnum.A
// or
myEnum.get('A')
// or
myEnum.get(1)
// or
myEnum.get('A | B')
// or
myEnum.get(3)
// get your value
myEnum.A.value
// get your key
myEnum.A.key
// get all items
myEnum.enums // returns all enums in an array
// check if it's defined
myEnum.isDefined(myEnum.A) // returns true
myEnum.isDefined('A') // returns true
myEnum.isDefined(1) // returns true
// compare
myEnum.A.is(myEnum.A)
// or
myEnum.A.is('A')
// or
myEnum.A.is(1)
// or
myEnum.A == myEnum.A
// or
myEnum.A === myEnum.A
// check flag
var myItem = myEnum.get(3); // or [myEnum.get('A | B')]
myItem.has(myEnum.A)
// or
myItem.has('A')
// or
myItem.has(1)
// other functions
myItem.toString() // returns 'A | C'
myItem.toJSON() // returns '"A | C"'
myItem.valueOf() // returns 3
JSON.stringify(myItem) // returns '"A | C"'
//Type Safety:
//Newly created enumerable objects are Type-Safe in a way that it's non-configurable and no longer extensible.
//Each EnumItem has a beack-reference to a constructor and they are implicitly final.
Object.getOwnPropertyDescriptor(myEnum, 'Red'); //=> Object {value: EnumItem, writable: false, enumerable: true, configurable: false}
Object.isExtensible(myEnum); //=> false
myEnum instanceof Enum; //=> true
//Instances of Enum created with 'new' from similar objects are not equal
myEnum1=new Enum({'A':1, 'B':2, 'C':4});
myEnum2=new Enum({'A':1, 'B':2, 'C':4});
myEnum1 == myEnum2 //=> false
myEnum1.A == myEnum2.A //=> false
myEnum1.A.value == myEnum2.A.value //=> true
//This enum object has no properties other than those defined during its creation. Existing Data is 'Persistent' and preserves the original version
myEnum.B.value; //=> 2
myEnum.B = 5; //=> Throws TypeError
delete myEnum.B; //=> false
myEnum.D = 6; //=> doesn't add to the enum object, silently ignores
myEnum.D; // undefined
//Try to define new property throws TypeError
Object.defineProperty(myEnum, D, {value:6, writable:false, enumerable:true});
//=>TypeError: Cannot define property:D, object is not extensible.Copyright (c) 2016 Adriano Raiano, Christoph Hermann
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