Enums, BitFlags, BitFields, BitMasks and BitArrays for JavaScript & TypeScript.
const options = new BitFlags('OPTION1', 'OPTION2', 'OPTION3');
const configuration = options.createBitField();
configuration.on(options.OPTION1 | options.OPTION3); // Set option1 & option3 bits to true
configuration.on(options.OPTION1, options.OPTION3); // Same as the above
configuration.test(options.OPTION1); // true
configuration.test(options.OPTION2); // false
configuration.test(options.OPTION3); // true
configuration.testAny(options.OPTION1 | options.OPTION2); // true
configuration.testAll(options.OPTION1 | options.OPTION2); // false
configuration.count(); // 2
configuration.flipAll();
configuration.count(); // 1
configuration.test(options.OPTION2); // true
const clone = configuration.clone();
// Serialize
const serializedOptions = options.serialize(); // 'OPTION1,OPTION2,OPTION3'
const serializedBitfield = configuration.serialize(); // '010'
// Deserialize
const deserializedOptions = BitFlags.deserialize(serializedOptions);
const deserializedBitfield = BitField.deserialize(serializedBitfield);BitFields and BitArrays are interchangeable, their APIs are identical. The only difference between them is how many flags they support (BitField is limited to 31 flags) and their performance (BitField is about 25% faster than BitArray). This is due to how they internally store the data.
const Day = new Enum('MONDAY', 'TUESDAY', 'WEDNESDAY', 'THURSDAY', 'FRIDAY', 'SATURDAY', 'SUNDAY');
console.log(Day.MONDAY); // EnumConstant('MONDAY':0)
console.log(Day.MONDAY.name); // 'MONDAY'
console.log(String(Day.MONDAY)); // 'EnumConstant(MONDAY:0)'
console.log(Day.FRIDAY.ordinal); // 4
console.log(Number(Day.FRIDAY)); // 4
// Enums are immutable
Day.MY_OWN_DAY = 1337; // TypeError: Cannot add property MY_OWN_DAY, object is not extensible
Day.MONDAY = 42; // TypeError: Cannot set property MONDAY of [object Object] which has only a getter
// Enums are iterable
console.log(Object.keys(Day)); // ['MONDAY', 'TUESDAY', 'WEDNESDAY', 'THURSDAY', ...]
console.log(Day.values()); // [EnumConstant('MONDAY':0), EnumConstant('TUESDAY':1), ...]
for (let value of Day) {}
Day.forEach((value, name) => {});
// Enums are easy to use
switch (value) {
case Day.MONDAY:
break;
case Day.TUESDAY:
break;
}
console.log(Day.MONDAY.equals(Day.FRIDAY)); // false
console.log(Day.MONDAY === OtherEnum.CONSTANT); // false
console.log(Day.MONDAY == OtherEnum.CONSTANT); // falseNote that the examples above uses ECMAScript 2015 features.
// Typings for the Enum class is not provided, use TypeScripts' enum instead!
enum Direction { NORTH, SOUTH, EAST, WEST }
// No typings for BitFlags either. Again, use TypeScripts' enum!
enum FontStyle {
NORMAL = 0,
BOLD = 1 << 1,
ITALICS = 1 << 2,
UNDERSCORED = 1 << 3,
UPPERCASE = 1 << 4,
MY_FAVORITE = BOLD | ITALICS
}
const configuration: BitSet<FontStyle> = new BitField<FontStyle>();
configuration.on(FontStyle.BOLD | FontStyle.UPPERCASE);
configuration.off(Direction.NORTH); // ERROR: argument type Direction is not assignable to parameter type FontStyleFrom NPM: run npm install easy-bits --save.
From GitHub: download easy-bits.min.js.
ES2015 style: import { Enum } from 'easy-bits';.
or link in HTML: <script src="easy-bits.min.js"></script>.
| Environment | Supported Version |
|---|---|
| Node | 8 and up |
| Chrome | 26 and up |
| Firefox | 4 and up |
| Edge | 13 and up |
| Internet Explorer | 10 and up |
| Safari | 7 and up |
Use the issue tracker to report bugs or make feature requests. Pull requests are welcome, but it may be a good idea to create an issue to discuss any changes beforehand.
MIT, see LICENSE file.