What this snippet does
If an iterator never returns done: true, for..of loops will run infinitely until the call stack overflows.
Expected output
safe
Why practise typing this
Typing symbols & iterators code builds muscle memory for the symbols and indentation TypeScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More TypeScript practice
- Declaring a unique symbolSymbols & Iterators · advanced
- Using Symbol.iterator to make an object iterableSymbols & Iterators · advanced
- Accessing symbol properties with string keysSymbols & Iterators · advanced
- Implementing a basic iterator interfaceSymbols & Iterators · advanced
- Custom collection iterator with done stateSymbols & Iterators · advanced
- Creating a basic generator functionSymbols & Iterators · advanced