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). 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 . Jan 26, 2017 · I found the following in a TypeScript declaration file for Angular: interface IDirective{ compile?: (templateElement: IAugmentedJQuery, What does the ?: after compile do?
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 the value of a . The key aspect to interfaces in typescript that distinguish them from types is that they can be extended with new functionality after they've already been declared.
I found the following in a TypeScript declaration file for Angular.
Typescript - Safe navigation operator (?.) or (!.) and null property.
Interfaces vs Types in TypeScript - Stack Overflow.
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Sources
- https://stackoverflow.com/questions/61480993/when-should-i-use-nullish-coalescing-vs-logical-or
- https://stackoverflow.com/questions/15260732/does-typescript-support-the-operator-and-whats-it-called
- https://stackoverflow.com/questions/23557030/what-does-mean-in-typescript
- https://stackoverflow.com/questions/40238144/safe-navigation-operator-or-and-null-property-paths
