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 vote143 views1 answer
Loc multiple conditions string and integer
TypeScript
17 votes138 views3 answers
Router params angular
TypeScript
0 vote129 views1 answer
What types of troop advancements were involved, and why were both needed in dday
TypeScript
0 vote138 views1 answer
Ts add property to interface
TypeScript
0 vote147 views2 answers
Python check if dir exists else create
TypeScript
8 votes158 views3 answers
Your account has reached its concurrent builds limit
TypeScript
0 vote142 views1 answer
How to remove second square brackets in an array
TypeScript
27 votes293 views3 answers
Styled components in react
TypeScript
6 votes131 views2 answers
How to print 4 digits after decimal in c++
TypeScript
0 vote125 views1 answer
Queryselectorall of multiple tags
TypeScript