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custom type guard typescript

Healthy Hoopoe answered on November 9, 2023 Popularity 8/10 Helpfulness 5/10

answer custom type guard typescript

custom type guard typescript

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// type gurad

interface User1 {
  name: string;
  address: string;
}

interface User2 {
  name: string;
  age: number;
}

type User = User1 | User2;
// Custorm guards
const isUSer1 = (U: User): U is User1 => {
  return (U as User1).address !== undefined;
};

const User1: User = { name: "Tanvir", address: "Dhaka" };
const User2: User = { name: "Shipon", age: 20 };

console.log(isUSer1(User1)); // Logs true
console.log(isUSer1(User2)); // Logs false

Popularity 8/10 Helpfulness 5/10 Language typescript

Source: Grepper

Tags: custom-type guard typescript

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Contributed on Nov 09 2023

Healthy Hoopoe

0 Answers Avg Quality 2/10

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