The + operator is not just for numbers and can have sideeffects, if
the operands have different types or the operands are not numbers or
strings (and even in that case). This makes the + operator tricky.
>>> "boo" + 1 + 2
"boo12"
>>> 1 + 2 + "boo"
"3boo"
>>> var a = {toString: function () { return 1; }, valueOf: function () { return
>>> 2; }}, b = 0; a + b
2
--
Poetro
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