The same pattern is widely used to test whether an array-like object is empty. Since a length of 0 is also "falsey", it evaluates as false when the array has no

The same pattern is widely used to test whether an array-like object is empty. Since a length of 0 is also "falsey", it evaluates as false when the array has no elements. A typo in this case would result in the tested array always being "empty".