Declaration of array in TypeScript [duplicate]

Question

I have some experience with TypeScript, but one thing just keeps playing on my mind. I know the difference between Array<string> and string[]. I know that the declarations can be used interchangeably, f.e.

export class SomeClass {

   someDeclaration: Array<SomeObject>;
   otherDeclaration: SomeObject[];

}

But in my work, I faced other declaration structure, namely:

export class OtherClass {

   strangeDeclaration: [SomeObject];

}

My question is: Is it correct way to declaring array? Which difference is beetwen this way and other (most popoular) ways? Where does the structure come from?

An even better question to close against: stackoverflow.com/questions/36741917/… And there's this one too: stackoverflow.com/questions/39274045/… And this one: stackoverflow.com/questions/43225857/… And this one: stackoverflow.com/questions/39613923/… — Louis
– Louis, Commented Oct 25, 2017 at 12:33

Per Svensson · Accepted Answer · 2017-10-25 12:26:22Z

4

TypeScript arrays can be written Array<T> or T[] as you suggested.

The other type is a "Tuple". In TS this translated to a index typed array. E.g. it's a array with a fixed type at the given position.

Example 'tuple array': [Number, String]

Ts Docs explains this very well

answered Oct 25, 2017 at 12:26

Per Svensson

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