Closed
Description
Current Status
- The TC39 proposal is now at stage 3 (🎉🎉🎉🎉🎉)
- Implementation is in progress
- You can expect this feature in TypeScript 3.7
- We'll update here when it's available in a nightly build
- Holding off on Optional Call until its semantics are clarified at committee
Open questions
- What special-casing, if any, should
document.all
get?
C# and other languages have syntax sugar for accessing property chains where null
(or in our case, undefined
) might be encountered at any point in the object hierarchy.
var x = { y: { z: null, q: undefined } };
console.log(x?.y?.z?.foo); // Should print 'null'
console.log(x?.baz); // Still an error
console.log(x.y.q?.bar); // Should print 'undefined'
Need proposal on what exactly we should codegen, keeping in mind side effects of accessors.
Edit by @DanielRosenwasser February 27, 2018: This proposal is also called the "null propagation" operator.
Activity