Ts Playground 37

const numbers: Numbers = [1, 2, 3]; console.log(numbers[0]); // 1

// TypeScript now knows 'x' is a string here! console.log(x.toUpperCase()); ts playground 37

Finally stopped the if (a && a.b && a.b.c) madness. const numbers: Numbers = [1, 2, 3]; console

The "TS Playground 37" configuration isn't just an old version; it represents the moment TypeScript fully embraced the future of JavaScript syntax. It brought Optional Chaining and Nullish Coalescing to the masses long before they were standard in all browsers. If you encounter a challenge or puzzle labeled "TS Playground 37," your solution will almost certainly rely on using ?. or ?? effectively. const numbers: Numbers = [1

console.log(userWithAddress.address?.street); // "123 Main St" console.log(userWithAddress.address?.street?.toUpperCase()); // "123 MAIN ST"