Why is it for ... unsuccessfully elegant, but ... for throwing an Exception?

Question

Why is this

for (let e in null) void e 

gracefully crashes but

 for (let e of null) void e 

throws a TypeError ? Does this lead to inconsistency?

Answer 1

for...of only works with iterable objects (i.e. objects that implement the iterative protocol ), which null is not one of them. While for...in works with all values.