Why use triple-equal (===) in TypeScript? - Stack Overflow
Jul 20, 2019 · JavaScript as the target of compilation (TypeScript design goal 4) All TypeScript must be representable in JavaScript. Further, it should be idiomatic JavaScript where possible. …
What's the meaning of "=>" in TypeScript? (Fat Arrow)
In TypeScript, everything that comes after the : but before an = (assignment) is the type information. So your example is saying that the type of MakePoint is a function that takes 0 …
Does Typescript support the ?. operator? (And, what's it called?)
Jan 17, 2017 · 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 …
When should I use ?? (nullish coalescing) vs || (logical OR)?
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). …
In TypeScript, what is the ! (exclamation mark / bang) operator …
Feb 16, 2017 · It is explained in the TypeScript release notes: A new ! post-fix expression operator may be used to assert that its operand is non-null and non-undefined in contexts …
What is TypeScript and why should I use it instead of JavaScript ...
TypeScript is a superset of the JavaScript language that has a single open-source compiler and is developed mainly by a single vendor: Microsoft. The goal of TypeScript is to help catch …
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 …
How do I dynamically assign properties to an object in TypeScript ...
TypeScript is used to catch (potential) errors at compile time. If you cast to any to mute errors then you lose the power of typing and may as well go back to pure JS. any should ideally only …
Is key-value pair available in TypeScript? - Stack Overflow
Apr 7, 2016 · KeyValue interface exists in angular library that uses typescript. So you have this generic interface to use if your project is angular. Or you can use its declaration to get a nice …
What does enclosing a class in angle brackets "<>" mean in …
Typescript is a transpiled, not compiled, so essentially all that happens is a conversation to JavaScript. There is no casting at runtime and both {} as Type and <Type>{} have the same …