You can actually accomplish this using only boolean logic, although there’s perhaps no practical value of that in your example. The boolean version is much more involved than simply counting the number of true values. Anyway, for the sake of satisfying intellectual curiosity, here goes. First, the idea of using a series of XORs is … Read more
It has to do with mutual exclusion. xor is exclusive. or is inclusive. Truth Table Comparison $x $y ($x or $y) ($x xor $y) 0 0 0 0 1 0 1 1 0 1 1 1 1 1 1 0 Note: the difference in the last case. xor is only true when either $x or … Read more
Variables defined in YAML files (playbooks, vars_files, YAML-format inventories) YAML principles Playbooks, vars_files, and inventory files written in YAML are processed by a YAML parser first. It allows several aliases for values which will be stored as Boolean type: yes/no, true/false, on/off, defined in several cases: true/True/TRUE (thus they are not truly case-insensitive). YAML definition … Read more
For Boolean values, they mean the same thing – although there’s a compound assignment operator for XOR: x ^= y; There’s no equivalent compound assignment operator for inequality. As for why they’re both available – it would be odd for XOR not to be available just because it works the same way as inequality. It … Read more
To run a task when destroy is true: — – hosts: localhost connection: local vars: destroy: true tasks: – debug: when: destroy and when destroy is false: — – hosts: localhost connection: local vars: destroy: false tasks: – debug: when: not destroy
I’ll be the odd voice out (since all answers are decrying the use of the fact that False == 0 and True == 1, as the language guarantees) as I claim that the use of this fact to simplify your code is perfectly fine. Historically, logical true/false operations tended to simply use 0 for false … Read more
Splitting an expression that’s too nested and complicated into simpler sub-expressions assigned to local variables, then put together again, is quite a common and popular technique — quite independently of whether the sub-expressions and/or the overall expression are boolean or of just about any other type. With well-chosen names, a tasteful decomposition of this kind … Read more
isBeforeTheLastItem isInFrontOfTheLastItem isTowardsTheFrontOfTheList Maybe too wordy but they may help give you ideas.
Since nobody has broached the subject of why these are useful: I use bitwise operations a lot when working with flags. For example, if you want to pass a series of flags to an operation (say, File.Open(), with Read mode and Write mode both enabled), you could pass them as a single value. This is … Read more
If you use fmt package, you need %t format syntax, which will print true or false for boolean variables. See package’s reference for details.