Jul 20, 2019 · In JavaScript, it's commonly seen as best practice to use === instead of ==, for obvious and well-known reasons. In TypeScript, which is one to be preferred? Is there even …

Jan 17, 2017 · Yes. As of TypeScript 3.7 (released on November 5, 2019), this feature is supported and is called Optional Chaining: At its core, optional chaining lets us write code …

The ?? operator was added to TypeScript 3.7 back in November 2019. And more recently, the ?? operator was included in ES2020, which is supported by Node 14 (released in April 2020).

What is the TypeScript language? What can it do that JavaScript or available libraries cannot do, that would give me reason to consider it?

Feb 16, 2017 · In TypeScript, what is the ! (exclamation mark / bang) operator when dereferencing a member? Asked 8 years, 8 months ago Modified 5 months ago Viewed 651k …

Typescript needs to know that the function into which you pass an object is functioning like a type guard. If it just returns type true or false, how can Typescript know that it's indeed a type guard …

Declaration Merging The key aspect to interfaces in typescript that distinguish them from types is that they can be extended with new functionality after they've already been declared. A …

Jun 22, 2018 · That is a "definite assignment assertion": varname !: sometype informs typescript not to worry about checking if varname might be unassigned (it tells typescript that varname …

Apr 21, 2019 · The as keyword is a type assertion in TypeScript which tells the compiler to consider the object as another type than the type the compiler infers the object to be.

Apr 25, 2016 · Fixed size array would look like const arr = new Array<number>(3);, though technically it will not be fixed ofc The "fixed length arrays" are an entirely different feature. So, …