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Problem:

I am currently wondering why I am getting below compile error if I just declare variable with var or let keywords? I want to say, below code goes well:

export class MyAppComponent {
myRefreshClickStream$: any;
constructor(){
}
}

While this brings the error:

export class MyAppComponent {
var myRefreshClickStream$: any;
constructor(){
}
}

 

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1 Answer

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Solution :

If you look inside your class carefully, then you will realize that TypeScript will not permit a declaration of class members by

· Using var keyword

· Using let keyword

· Using const (you can use readonly on the property)

Also, if you look inside of a class then you will realize that you will be prohibited from declaring the functions by

· Using function keyword

So the correct way to write the code which you were looking for is as below :

export class MyAppComponent {
  x: string = "fooo";

  y: string = "barr";

 fooo(): void { }

constructor(){

  }

}

And clearly not the way as shown below,

export class MyAppComponent {

var x: string = "fooo";

let y: string = "barr";

function fooo(): void { }

constructor(){

  }

}

Hope the above mentioned code and explanation will surely help you in clearing your doubts related to coding.

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