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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | 2x 3x 3x 3x 3x 2x | import IClock from './IClock' // the raw materials import * as Clocks from './clocks' interface AbsClockFactory { clockType : string instance() : IClock numCreated() : number } class ClockFactory1 implements AbsClockFactory { clockType = "Clock1" numcreated = 0 public instance() : IClock { this.numcreated++; return new Clocks.Clock1} public numCreated() : number {return this.numcreated} } class ClockFactory2 implements AbsClockFactory { clockType = "Clock2" numcreated = 0 public instance() : IClock { this.numcreated++; return new Clocks.Clock2} public numCreated() : number {return this.numcreated} } class ClockFactory3 implements AbsClockFactory { clockType = "Clock3" numcreated = 0 public instance() : IClock { this.numcreated++; return new Clocks.Clock3} public numCreated() {return this.numcreated} } // these classes all share some code, so you could make // an abstract class and have them all inherit from it, abstract class ClockFactorySuperClass implements AbsClockFactory { abstract clockType: string protected numcreated = 0 public abstract instance() : IClock public numCreated() {return this.numcreated} } class ClockFactory1asSubclass extends ClockFactorySuperClass implements AbsClockFactory { clockType = "Clock1" public instance() : IClock { this.numcreated++; return new Clocks.Clock3} } class ClockFactory2asSubclass extends ClockFactorySuperClass implements AbsClockFactory { clockType = "Clock3" public instance() : IClock { this.numcreated++; return new Clocks.Clock3} } class ClockFactory3asSubclass extends ClockFactorySuperClass implements AbsClockFactory { clockType = "Clock3" public instance() : IClock { this.numcreated++; return new Clocks.Clock3} } // choose which of the factories to export, but don't // tell anybody which one it is. export default ClockFactory1 // export default ClockFactory2 // export default ClockFactory3 |