Typescript exclamation mark

//Normally when you declare a member (which doesn't include undefined in it's type) 
//it has to be initialized directly or in the constructor. 
//Otherwise Typescript will raise an error.
//If you add ! after the name, TypeScript will ignore this and not show an error 
//if you don't immediately initialize it:

//Example

foo: string; // error: Property 'foo' has no initializer and is not definitely assigned in the constructor.
bar!: string; // no error

Source: stackoverflow.com

Similar codes

0 vote368 views1 answer
How to set date axes limits in matplotlib plot
TypeScript
1 vote374 views1 answer
Git count commits by author
TypeScript
1 vote338 views3 answers
Roperty 'form' has no initializer and is not definitely assigned in the constructor.
TypeScript
0 vote322 views1 answer
Uncheck all checkboxes typescript
TypeScript
-2 votes318 views3 answers
Typescript count array condition
TypeScript
0 vote327 views1 answer
Reports for market research
TypeScript
6 votes394 views1 answer
Angular forkjoin
TypeScript
0 vote310 views1 answer
Typescript array of empty objects
TypeScript
0 vote347 views1 answer
Mixins with parameters typescript
TypeScript
0 vote334 views1 answer
Keyboard shortcuts spotify
TypeScript