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    \$\begingroup\$ Note that 0 in a and a[0] will fail for sparse arrays such as a = [,1,2]. Thus, !a.length is the most safe way to test for an empty array. When taking advantage of type casting to string, a==0 is another solution that directly returns a boolean value. \$\endgroup\$ Commented Sep 8, 2017 at 16:06
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    \$\begingroup\$ @TomasLangkaas but [0]==0 as well, so a==0 doesn't always work \$\endgroup\$ Commented Dec 19, 2021 at 21:27