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Why use triple-equal (===) in TypeScript? - Stack Overflow 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 preferable
Does Typescript support the ?. operator? (And, whats it called?) 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 immediately stop running some expressions if we run into a null or undefined The star of the show in optional chaining is the new ? operator for optional property accesses Refer to the TypeScript 3 7
In TypeScript, what is the ! (exclamation mark bang) operator when . . . 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 convenience of omitting all the checks) or using the (loose) inequality comparisons
typescript - How can I define an interface for an array of objects . . . Yes, your example of defining an interface only for the particular items would be a more useful way to do it It would be quite rare to have an array of items, but not want to conveniently reference a single item Using a real array also exposes length on the interface, which will probably be used quite often