Category: TypeScript

Sometimes, we want to convert a boolean a to string value with TypeScript.

In this article, we’ll look at how to convert a boolean a to string value with TypeScript.

How to convert a boolean a to string value with TypeScript?

To convert a boolean a to string value with TypeScript, we can use the String function.

For instance, we write

const myBool: boolean = true;
const myString: string = String(myBool);

to call String with myBool to return myBool converted to a string.

Conclusion

To convert a boolean a to string value with TypeScript, we can use the String function.

Sometimes, we want to use enum as a restricted key type in TypeScript.

In this article, we’ll look at how to use enum as a restricted key type in TypeScript.

How to use enum as a restricted key type in TypeScript?

To use enum as a restricted key type in TypeScript, we can use the in keyword.

For instance, we write

enum MyEnum {
  First,
  Second,
}

let layer: { [key in MyEnum]: any };

to create the { [key in MyEnum]: any } type which restricts the keys of the object with the given type to the keys in MyEnum.

We can also make the keys optional with

let layer: { [key in MyEnum]?: any };

We put a ? after [key in MyEnum] to make the keys optional.

Conclusion

To use enum as a restricted key type in TypeScript, we can use the in keyword.

Sometimes, we want to import moment.js with TypeScript.

In this article, we’ll look at how to import moment.js with TypeScript.

How to import moment.js with TypeScript?

To import moment.js with TypeScript, we can import the whole package with import.

To import moment.js, we write

import * as moment from "moment";

to import the 'moment' module as moment.

Conclusion

To import moment.js with TypeScript, we can import the whole package with import.

Sometimes, we want to set window.location with TypeScript.

in this article, we’ll look at how to set window.location with TypeScript.

How to set window.location with TypeScript?

To set window.location with TypeScript, we can set the window.location.href property to the URL path we want to go to.

For instance, we write

window.location.href = "/url";

to navigate to the /url URL by setting window.location.href to the URL string.

Conclusion

To set window.location with TypeScript, we can set the window.location.href property to the URL path we want to go to.

Sometimes, we want to declare and import TypeScript interfaces in a separate file.

In this article, we’ll look at how to declare and import TypeScript interfaces in a separate file.

How to declare and import TypeScript interfaces in a separate file?

To declare and import TypeScript interfaces in a separate file, we can use the export keyword to export interfaces.

For instance, we write

export interface ISampleInterface {
  key: string;
  value: string;
}

to export the ISampleInterface interface with export.

Then we can import it by writing

import { ISampleInterface } from "./ISampleInterface";
let sampleVar: ISampleInterface;

to import the ISampleInterface member from ./ISampleInterface.

And then we use that as a type for the sampleVar variable.

Conclusion

To declare and import TypeScript interfaces in a separate file, we can use the export keyword to export interfaces.