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typescript check if object is of type interface

Grotesque Goat answered on September 23, 2022 Popularity 10/10 Helpfulness 4/10

answer typescript check if object is of type interface

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typescript check if object is of type interface

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// An "interface" is a TypeScript concept, and does not exist during run-time.  You cannot check if an obeject is of type interface.

// You can, however, check if an object is shaped like your interface:

interface User {
  firstName: string
  lastName: string
}

function isUser(v: any): v is User {
  return typeof v === 'object' && v !== null
  	&& typeof v.firstName === 'string'
    && typeof v.lastName === 'string'
}

const u: unknown = // something unknown

if (isUser(u)) {
  // TypeScript will recognize `u` is now a `User` interface
}

Popularity 10/10 Helpfulness 4/10 Language typescript

Source: Grepper

Tags: interface object typescript

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Contributed on Sep 23 2022

Grotesque Goat

0 Answers Avg Quality 2/10

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check if object is of interface typescript

Comment

interface Person {
  name: string;
  age: number;
}

const person: Person = { name: "John Doe", age: 30 };

if (person instanceof Person) {
  console.log("object is of interface type!");
} else {
  console.log("object is not of type Person interface");
}

Popularity 9/10 Helpfulness 5/10 Language typescript

Source: Grepper

Tags: interface inte

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Contributed on Apr 07 2023

Kind Kangaroo

0 Answers Avg Quality 2/10

typescript check if object is of type interface

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check if object is of interface typescript

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