create-mixin

create-mixin

Useful for achieving something resembling multiple-inheritence in Javascript.

const mixInto = require('create-mixin')
const EventEmitter = require('events')

class EmittingArray extends mixInto(EventEmitter)(Array) {}

Example

Given these two classes.

class Base {
  constructor () {
    this.ranBaseConstructor = true
  }
  baseMethod () {
    return 1
  }
}

class Mixin {
  constructor () {
    this.ranMixinConstructor = true
  }
  someMethod () {
    return 2
  }
}

Create a new class mixing one class into another.

> const mixInto = require('create-mixin')

> class Something extends mixInto(Mixin)(Base) {}

Behaviour of new class.

> const something = new Something()

> /* new class has methods of both source classes */
> something.baseMethod()
1

> something.someMethod()
2

> /* Only the base constructor is run */
> something.ranBaseConstructor
true

> something.ranMixinConstructor
undefined

> something instanceof Base
true

> something instanceof Mixin
false

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© 2018-19 Lloyd Brookes <[e-mail]>.