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typescript check type of variable
By 
Dotch
on Dec 03, 2020
Dotch
on Dec 03, 2020
if (fooOrBar instanceof Foo){
// TypeScript now knows that `fooOrBar` is `Foo`
}Source: stackoverflow.com
3
typescript check type
By Dotch
on Dec 03, 2020
Dotch
on Dec 03, 2020
mySprite instanceof Sprite;Source: stackoverflow.com
1
typescript get type
By Faithful Fish
on Sep 14, 2020
Faithful Fish
on Sep 14, 2020
if (typeof abc === "number") {
// do something
}Source: stackoverflow.com
1
custom types in typescript
By v!v
on May 15, 2020
v!v
on May 15, 2020
// simple type
type Websites = 'www.google.com' | 'reddit.com';
let mySite: Websites = 'www.google.com' //pass
//or
let mySite: Website = 'www.yahoo.com' //error
// the above line will show error because Website type will only accept 2 strings either 'www.google.com' or 'reddit.com'.
// another example.
type Details = { id: number, name: string, age: number };
let student: Details = { id: 803, name: 'Max', age: 13 }; // pass
//or
let student: Details = { id: 803, name: 'Max', age: 13, address: 'Delhi' } // error
// the above line will show error because 'address' property is not assignable for Details type variables.
//or
let student: Details = { id: 803, name: 'Max', age: '13' }; // error
// the above line will show error because string value can't be assign to the age value, only numbers.
Source: www.youtube.com
5
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