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]>.