boolean-expression

Ruby: Boolean attribute naming convention and use

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Edit: three-years later; the times, they are a-changin’… Julik’s answer is the simplest and best way to tackle the problem these days: class Foo attr_accessor :dead alias_method :dead?, :dead # will pick up the reader method end My answer to the original question follows, for posterity… The short version: You can’t use a question mark … Read more

Priority (precedence) of the logical operators (order of operations) for NOT, AND, OR in Python

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It’s NOT, AND, OR, from highest to lowest according to the documentation on Operator precedence Here is the complete precedence table, lowest precedence to highest. A row has the same precedence and groups from left to right 0. := 1. lambda 2. if – else 3. or 4. and 5. not x 6. in, not … Read more

Is there any reason for “Boolean.TRUE.equals(x)” in Java?

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I hope foo.isBar() returns a boolean. In that case you can always write if (foo.isBar()). If you foo.isBar() returns Boolean then it can be either Boolean.TRUE, Boolean.FALSE or NULL. In that case if (Boolean.TRUE.equals(foo.isBar())) makes sure the if block is executed in one scenario(TRUE) and omitted in remaining 2. Over and above if (foo.isBar()) will … Read more

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