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State Subclassing example
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export default class Account extends StateMachine { | |
constructor() { | |
this._balance = 0; | |
} | |
$enter() { | |
this.open(); | |
} | |
open() { | |
this._setState("Open"); | |
} | |
close() { | |
this._setState("Closed"); | |
} | |
getAvailable() { | |
return this._balance; | |
} | |
static _states() { | |
return [ | |
class Open extends this { | |
deposit(amount) { | |
this._balance += amount; | |
} | |
withdraw(amount) { | |
this._balance -= amount; | |
} | |
placeHold() { | |
this._setState("Open.Held"); | |
} | |
static _states() { | |
return [ | |
class Held extends this { | |
deposit(amount) { | |
// Not allowed when held. | |
} | |
withdraw() { | |
// Not allowed when held. | |
} | |
getAvailable() { | |
return 0; | |
} | |
releaseHold() { | |
this._setState("Open"); | |
} | |
} | |
] | |
} | |
}, | |
class Closed extends this { | |
deposit(amount) { | |
} | |
getAvailable() { | |
return 0; | |
} | |
} | |
]; | |
} | |
} |
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