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function f1(a, bIs, [b]=[3]) {
assertEq(a, 1);
assertEq(b, bIs);
}
assertEq(f1.length, 2);
f1(1, 3);
f1(1, 42, [42]);
f1(1, 3, undefined);
function f2(a, bIs, [b]=[]) {
assertEq(a, 1);
assertEq(b, bIs);
}
assertEq(f2.length, 2);
f2(1, undefined);
f2(1, 42, [42]);
f2(1, undefined, undefined);