guard typescript code example
Example 1: custom types in typescript
type Websites = 'www.google.com' | 'reddit.com';
let mySite: Websites = 'www.google.com'
let mySite: Website = 'www.yahoo.com'
type Details = { id: number, name: string, age: number };
let student: Details = { id: 803, name: 'Max', age: 13 };
let student: Details = { id: 803, name: 'Max', age: 13, address: 'Delhi' }
let student: Details = { id: 803, name: 'Max', age: '13' };
Example 2: type gurad
1) Type guards narrow down the type of a variable within a conditional block.
2) Use the 'typeof' and 'instanceof operators to implement type guards in the
conditional blocks.
if (typeof a === 'number' && typeof b === 'number') {
return a + b;
}
(instanceof)
if (job instanceof detail){
jobless = false ;
}