/TypeScript/Typescript "variable!: type" notation

Typescript "variable!: type" notation

// Writing ! after any expression is effectively a type assertion 
// that the value isn’t null or undefined
function liveDangerously(x?: number | null) {  // No error  console.log(x!.toFixed());}Try

Source: typescriptlang.org

Typescript "variable?: type" notation

// the "last" property is optional and can be undefined
function printName(obj: { first: string; last?: string }) {  // ...}// Both OKprintName({ first: "Bob" });printName({ first: "Alice", last: "Alisson" });Try

Source: typescriptlang.org

Similar codes

0 vote199 views1 answer
How to check if folder already exists in google drive python
TypeScript
3 votes201 views2 answers
Push at first index typescript
TypeScript
0 vote218 views1 answer
Absolute import typescript react
TypeScript
7 votes199 views3 answers
If temp table exists drop
TypeScript
0 vote214 views1 answer
Whats a typedef in c++
TypeScript
0 vote259 views1 answer
Difference between statistical learning and machine learning
TypeScript
1 vote198 views1 answer
Python requests cookies to selenium
TypeScript
0 vote224 views1 answer
Wordpress get_posts custom posts by meta key
TypeScript
0 vote201 views1 answer
Createasyncthunk with typescript
TypeScript
1 vote219 views2 answers
What are the benefits of linux
TypeScript