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 …
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 …
What does the `is` keyword do in typescript? - Stack Overflow
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 …
What is TypeScript and why should I use it instead of JavaScript?
What is the TypeScript language? What can it do that JavaScript or available libraries cannot do, that would give me reason to consider it?
What does the pipe(|) mean in typescript? - Stack Overflow
Jul 28, 2016 · +1 -- TypeScript supports algabraic data types. If you're from an OOP background these are probably new to you, and can be very powerful. At a high level they are language …
In TypeScript, what does <T> mean? - Stack Overflow
Apr 3, 2018 · What does the <T> mean? That is TypeScript's Generics declaration. Excerpt: A major part of software engineering is building components that not only have well-defined and …
Defining TypeScript callback type - Stack Overflow
Oct 30, 2012 · I have defined function with typescript without defining a type. You can define a function with callback type parameter like below. You can define multiple return values in the …
Is key-value pair available in TypeScript? - Stack Overflow
Apr 7, 2016 · Is key-value pair available in TypeScript? If so, how do I do that? Can anyone provide sample, example, or links?
typescript - Safe navigation operator (?.) or (!.) and null property ...
the operation a! produces a value of the type of a with null and undefined excluded Optional chaining finally made it to typescript (3.7) 🎉 The optional chaining operator ?. permits reading …
Typescript: Check "typeof" against custom type - Stack Overflow
Jul 26, 2018 · TypeScript can infer types from values, but you can't generate values from types. const fruit = ["apple", "banana", "grape"] as const; export type Fruit = (typeof fruit)[number]; …