This is not strictly an answer but rather my contribution to the discussion I used the profiler to investigate a slightly-modified version of your code: N_arr = 200:400:3800; %// for medium to large sized input array for k1 = 1:numel(N_arr) A = randi(1,N_arr(k1)); [~]=eq(A,0); clear A A = randi(1,N_arr(k1)); [~]=not(A); clear A end I used … Read more
JavaScript traces its ancestry back to C, and C does not have a logical XOR operator. Mainly because it’s not useful. Bitwise XOR is extremely useful, but in all my years of programming I have never needed a logical XOR. If you have two boolean variables you can mimic XOR with: if (a != b) … Read more
@Jonathon Reinhart, your benchmark is unfortunately inconclusive. It does not take into account the effects of possible lazy-loading, caching and/or prefetching (by the CPU, the host OS and/or the .NET runtime). Shuffle the order of the tests (or call the test methods multiple times) and you might notice different time measurments. I did your original … Read more
Bitwise is useful for things in PHP just like anything else. How about a value that can have multiple states turned on at the same time? <?php // since we’re setting constant values in base10 we must progressively double // them since bitwise operations work in base2. you’ll see why when we output // these … Read more
|| is the logical-or operator. See here. It evaluates to true if at least one of the operands is true. You can only use it with boolean operands; it is an error to use it with integer operands. // Example var one = true || bar(); // result is true; bar() is never called var … Read more
The && and || operators short-circuit. That is: 1) If && evaluates its first operand as false, it does not evaluate its second operand. 2) If || evaluates its first operand as true, it does not evaluate its second operand. This lets you do null check && do something with object, as if it is … Read more
So what exactly is happening when you use the && and || operators with chaining values && is a binary operator, with one left-hand operand and one right-hand operand. The expression a && b && c && d && e is parsed based on associativity rules so that it looks like this: if (a && … Read more
AND is Standard SQL && is proprietary syntax
I prefer to think of it as “bitwise vs. conditional” rather than “logical vs conditional” since the general concept of “logical” applies in both cases. x & y // bitwise AND, 0101 & 0011 = 0001 x | y // bitwise OR, 0101 | 0011 = 0111 x && y // true if both x … Read more