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Exercise 3

Create an object factory that returns objects representing musical instruments. Each instrument should have a name and a type. Users of these objects should be able to play the instrument and show its type. Use the factory function to create three instruments:

A cello is a string instrument.
A flute is a wind instrument.
A drum is a percussion instrument.

let violin = createInstrument('violin', 'string');
violin.play();     // We are playing a tune on this violin
violin.showType(); // This violin is a string instrument

let flute = createInstrument('flute', 'wind');
flute.play();      // We are playing a tune on this flute
flute.showType();  // This flute is a wind instrument

let drum = createInstrument('drum', 'percussion');
drum.play();       // We are playing a tune on this drum
drum.showType();   // This drum is a percussion instrument

Solution

function createInstrument(name, type) {
  return {
    name: name,
    type: type,

    play() {
      console.log(`We are playing a tune on this ${this.name}.`);
    },

    showType() {
      console.log(`This ${this.name} is a ${this.type} instrument.`);
    }
  };
}

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