Does Typescript support the ?. operator? (And, what's it called?)
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 where TypeScript can …
Why use triple-equal (===) in TypeScript? - Stack Overflow
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 one which is …
In TypeScript, what is the ! (exclamation mark / bang) operator when ...
Feb 16, 2017 · It tells TypeScript to leave the expressions result as it is and pass it to JavaScript. It allows the use of JavaScript semantics in TypeScript, such as using loose equality (with the …
typescript - What does the "as" keyword do? - Stack Overflow
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.
typescript - 'unknown' vs. 'any' - Stack Overflow
Jul 20, 2018 · 881 TypeScript 3.0 introduces unknown type, according to their wiki: unknown is now a reserved type name, as it is now a built-in type. Depending on your intended use of unknown, you …
How do I dynamically assign properties to an object in TypeScript ...
Learn how to dynamically assign properties to an object in TypeScript with this helpful guide.
typescript - Is there a way to check for both `null` and `undefined ...
Although Typescript is a strongly typed language, it has the same problems with pointers and variables initialization inherited from Javascript. Javascript doesn't check whether a variable exists in the …
typescript - What is the Record type? - Stack Overflow
Jun 6, 2021 · What does Record<K, T> mean in Typescript? Typescript 2.1 introduced the Record type, describing it in an example: // For every properties K of type T, transform it to U function …
typescript - How to get names of enum entries? - Stack Overflow
I would like to iterate a TypeScript enum object and get each enumerated symbol name, for example: enum myEnum { entry1, entry2 } for (var entry in myEnum) { // use entry's name here, e.g., &q...
typescript - How do you specify that a class property is an integer ...
Oct 15, 2012 · TypeScript doesn't have "first-class" support for this so you have to do a cheeky hack. There's a library for this called newtype-ts that includes common types like Integer so you might just …