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TypeScript - generic types
10 points
In TypeScript it is possible to work with generic types in following ways.
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function print<T>(value : T) : void {2
console.log(value);3
}4
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function power<T extends number>(value : T) : void {6
let result = Math.pow(value, 2);7
8
console.log(result);9
}10
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print('text');12
print<string>('text');13
power(4);14
power<number>(4);Output:
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text2
text3
164
16xxxxxxxxxx1
2
class Utils<V extends number> {3
public print<T>(object : T) : void {4
console.log(object);5
}6
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public power(value : V) : void {8
let result = Math.pow(value, 2);9
10
this.print(result);11
}12
13
public multiply(value : V) : void {14
let result = 2 * value;15
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this.print(result);17
}18
}19
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let utils = new Utils<number>();21
22
utils.print('Results:');23
utils.power(4);24
utils.power<number>(4);25
utils.multiply(5);26
utils.multiply<number>(5);27
utils.print('Finished!');Output:
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Results:2
163
164
105
106
Finished!xxxxxxxxxx1
interface IInstrument<T> {2
getName() : string;3
getData() : T;4
playSong() : void;5
}6
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class Drum implements IInstrument<string> {8
public getName() : string {9
return 'Drum';10
}11
12
public getData() : string {13
return 'This is instruction how to play melody with drums...';14
}15
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public playSong() : void {17
console.log('This is drum song...');18
}19
}20
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let drum = new Drum();22
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console.log(`Name: ${drum.getName()}`);24
console.log(`Data: ${drum.getData()}`);25
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drum.playSong();Output:
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Name: Drum2
Data: This is instruction how to play melody with drums...3
This is drum song...