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CyberMew 2019-12-02 10:19:08 +08:00 • committed by GitHub
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@ -82,7 +82,7 @@ alert( Number(false) ); // 0
Please note that `null` and `undefined` behave differently here: `null` becomes zero while `undefined` becomes `NaN`.
````smart header="Addition '+' concatenates strings"
Almost all mathematical operations convert values to numbers. A notable exception is addition `+`. If one of the added values is a string, the other one is also converted to a string.
Almost all mathematical operations convert values to numbers. A notable exception is addition `+` operator. If one of the added values is a string, the other one is also converted to a string.
Then, it concatenates (joins) them: