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Mask Boxed JS number with valueOf
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| // Boxed JS number with valueOf method can mask its value. | |
| > three = new Number(3); // Box 3 as a Number object | |
| Number {} | |
| > three.valueOf = function () { return 1; }; | |
| function () { return 1; } | |
| > 2 + three | |
| 3 | |
| > 2 + 3 | |
| 5 | |
| > 2 + +three.toString() | |
| 5 |
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