Fix number truthiness by casting to individual types#857
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| if (object instanceof Integer) { | ||
| return (Integer) object != 0; | ||
| } | ||
| if (object instanceof Double) { | ||
| return (Double) object != 0; | ||
| } | ||
| if (object instanceof Long) { | ||
| return (Long) object != 0; | ||
| } | ||
| if (object instanceof Short) { | ||
| return (Short) object != 0; | ||
| } | ||
| return (Float) object != 0; |
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Alternatively, I could just do:
return ((Number)object).doubleValue() != 0;
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Unfortunately I don't think that will quite work - Python doesn't treat 0.0 as truthy
My mistake, it does! This is shorter and more to the point
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Yeah, I wrote it like that thinking it would be faster, but I tested it. This shorter way is faster for longs, about the same time for floats and ints so I'm going to do the simpler approach
| @@ -39,7 +39,19 @@ public static boolean evaluate(Object object) { | |||
| } | |||
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| if (object instanceof Number) { | |||
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There are more subclasses of Number. While you don't have to handle them all, perhaps a sane default would be to use Number.floatValue() to avoid a potential bad cast to Float.
| } | ||
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| @Test | ||
| public void itEvaluatesIntegers() { |
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might be worth a utility function here that takes a and b and does the assertions so you're not duplicating the code for every type.
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Truthiness for non-integer numbers functions differently in Jinjava than it does in Jinja. The following should print
yes, but since it currently only takes theNumber.intvalue(), it would return false. This PR fixes the issue by checking which type of Number the object is.