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這點是從 test coverage 裡看到的: if 代表這個程式會有兩種可能,但是我們 只測到了其中一種可能。補上測試碼之後我發現還是沒有測到,所以才找到了原程 式的 bug (isNegative 定義是會回傳字串,結果回傳的卻是 undefined)。雖然這 個 bug 並不影響程式執行,但是這打破了我們對函數定義的信任,所以必須要修 補。
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