Another option (for those who favour expressions over statements) can be built out of JavaScript's ternary operator:
return (typeof val === 'string') ? 'A' : (val === null || val === undefined) ? 'B' : val
Quite a popular pattern.
Ternary operators are really nice for simple and small statements, but I definitely wouldn't recommend them for anything complex. Makes things to hard to read for me. The same could be said for other developers.
That's not easy to read at all in my opinion...
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Another option (for those who favour expressions over statements) can be built out of JavaScript's ternary operator:
Quite a popular pattern.
Ternary operators are really nice for simple and small statements, but I definitely wouldn't recommend them for anything complex. Makes things to hard to read for me. The same could be said for other developers.
That's not easy to read at all in my opinion...