Here’s a table of the Ruby operators. The ones that are methods and overloadable are: [ ] [ ]= Element reference, element set ** Exponentiation ! ~ + – Not, complement, unary plus and minus (method names for the last two are +@ and -@) * / % Multiply, divide, and modulo + – Plus … Read more
It’s the right bit shift operator, ‘moves’ all bits once to the right. 10 in binary is 1010 shifted to the right it turns to 0101 which is 5
The technical reason why is found in §12.3.2: A conversion function is never used to convert a (possibly cv-qualified) object to the (possibly cv-qualified) same object type (or a reference to it), to a (possibly cv-qualified) base class of that type (or a reference to it), or to (possibly cv-qualified) void. The rationale is (likely) … Read more
It matches string to a regular expression. ‘hello’ =~ /^h/ # => 0 If there is no match, it will return nil. If you pass it invalid arguments (ie, left or right-hand sides are not correct), it will either throw a TypeError or return false.
Imagine that you have an elapsed time in seconds and you want to convert this to hours, minutes, and seconds: h = s / 3600; m = (s / 60) % 60; s = s % 60;
From the Haskell report, this is the syntax for allowed symbols: a | b means a or b and a<b> means a except b special -> ( | ) | , | ; | [ | ] | `| { | } symbol -> ascSymbol | uniSymbol<special | _ | : | ” | ‘> … Read more
My guess is that’s a direct carry-over from Perl. The operators or and and were added later in Perl 5 for specific situations were lower precedence was desired. For example, in Perl, here we wish that || had lower precedence, so that we could write: try to perform big long hairy complicated action || die … Read more
PHP will compare alpha strings using the greater than and less than comparison operators based upon alphabetical order. In the first example, ai comes before i in alphabetical order so the test of > (greater than) is false – earlier in the order is considered ‘less than’ rather than ‘greater than’. In the second example, … Read more
&& makes sure that the Bootloader function/object exists before calling the done method on it. The code takes advantage of boolean short circuiting to ensure the first expression evaluates to true before executing the second. See the short-circuit evaluation wikipedia entry for a more in-depth explanation.
I wasn’t going to post it, but thought that it might be of some help. Assuming of course that you don’t need the advanced generic logic in Jon’s post. public static class Extension { public static Boolean Operator(this string logic, int x, int y) { switch (logic) { case “>”: return x > y; case … Read more