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. …
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). …
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 …
In TypeScript, what is the ! (exclamation mark / bang) operator …
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 …
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 …
typescript - 'unknown' vs. 'any' - Stack Overflow
Jul 20, 2018 · 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, …
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 the `is` keyword do in typescript? - Stack Overflow
So by using the type guard, typescript now knows whether the pet is a Fish or Bird, so the corresponding APIs can be called without any design time linting errors. If it is "Super Critical" …
Difference between 'object' , {} and Object in TypeScript
Mar 24, 2018 · TypeScript has three confusing types: {}, Object, and object. You can't assign undefined nor null to any of those types except if the strictNullChecks compiler option is …
