number-isnan.js (753B)
1 assertEq(Number.isNaN(NaN), true); 2 assertEq(Number.isNaN(0/0), true); 3 assertEq(Number.isNaN(Number("NaN")), true); 4 assertEq(Number.isNaN(4), false); 5 assertEq(Number.isNaN(4.5), false); 6 assertEq(Number.isNaN("hi"), false); 7 assertEq(Number.isNaN("1.3"), false); 8 assertEq(Number.isNaN("51"), false); 9 assertEq(Number.isNaN(0), false); 10 assertEq(Number.isNaN(-0), false); 11 assertEq(Number.isNaN({valueOf: function () { return 3; }}), false); 12 assertEq(Number.isNaN({valueOf: function () { return 0/0; }}), false); 13 assertEq(Number.isNaN({ valueOf: function() { throw 17; } }), false); 14 assertEq(Number.isNaN({ toString: function() { throw 17; } }), false); 15 assertEq(Number.isNaN({ valueOf: function() { throw 17; }, toString: function() { throw 42; } }), false);