I (and many others) haven't posted here in a while, but I thought I'd give it a shot... :) In many languages, logic operators "and" and "or" have been...
... What the hey, I'll bite. It's bad practice. You're conflating different ideas- for example nil/null and false. Which becomes a problem if the programmer...
Replying to myself is bad etiquette, I know, but a new though just occurred to me. There is a logical fallacy a lot of people fall into that goes like this: ...
... These rules are operationally meaningless. The compiler has no access to what the programmer means or might mean, only to what he says, which always ...
... This is NOT operationally meaningless. It's just very generic. A couple of specific examples help. A classic example of violating rule #2 is the dangling...
... In one of several directory trees or ZIPfiles which mirror the package tree, is the more correct statement. The reason for that requirement is to permit...
Sorry for the short response, but the question remains... Python, Javascript, Lua, Ruby, all use "or" and "and" as: 1 or 2 => 1 1 and 2 => 2 Can there be a...
... Yes, this is called the "coalesce" operator. My language, Cobra, has this as "a ? b" which evals to "a" unless it's nil, in which case it evals to "b"....
... Lisp, too. Pretty much any language without a separate boolean type that isn't trying to be C-compatible will naturally do the same thing. -- They do not...
... foo()" which doesn't overload the logic operators? ... My language uses 'default' operator to achieve this. "x default 5" returns 5 if (and only if) the...
... There are languages beyond Python, Javascipt, Lua, and Ruby. And I should ask- what is the meaning of 1 or 2? I could make the cogent argument that the...
... Sure. It depends on how (and if) the language in question maps its values into booleans. Given that 1 is true (not the unique true value, but one of the...
Ahh, learn something every day :) What is the operator, if any, for the equivalent of "obj and obj.foo()"? One issue of introducing more operators is that you...
... For an obj that is a nilable type? You can say exactly that: def compute(t as List<of int>?) if t and t.count print t.count Notice the ? on the type which...
Questions - So why did you introduce a "default" operator vs. using "or"? And, why were you more strict about it than your coercive "+" operator? I ask only...
The '+' and 'or' operator (and most other) behave in similar way. The '+' operator tries to convert it's operands to numbers. The 'or' operator tries to...
I'm familiar with other languages also, I just mention the ones below because they have the same semantics. When you say "compiler guessing", do you mean the...
"It's not a format argument, but I thing it is valid, as language designers should apply certain amount of aesthetics when designing the language." I...
... it's the fact that without the "if", "or" is kind of kind of hanging out by itself, being indecisive, hah ... No, in this case there is not an option. The...
Another reason to avoid this type of overloading is that it breaks the operator's properties. 'Or' is normally symmetric operator (a or b == b or a). When you...
... The && and || flavors of 'or' and 'and' aren't symmetrical anyway with respect to undefined expressions. Ada neatly expresses their conditional nature by...
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