The official name is “server-side scripting delimiters” or “ASP.NET inline expressions”. Visual Studio 2008 syntax highlighting settings dialog calls these “HTML Server-Side Script”. Microsoft guys call them “code nuggets” in their blogs. <%@ %> is a Directive for ASP.NET Web Pages. Used for pages and controls to configure page/control compiler settings (<%@ Control Inherits=”MyParentControl” %>). … Read more
The double arrow operator, =>, is used as an access mechanism for arrays. This means that what is on the left side of it will have a corresponding value of what is on the right side of it in array context. This can be used to set values of any acceptable type into a corresponding … Read more
In C and in C++ single quotes identify a single character, while double quotes create a string literal. ‘a’ is a single a character literal, while “a” is a string literal containing an ‘a’ and a null terminator (that is a 2 char array). In C++ the type of a character literal is char, but … Read more
That’s the + unary operator. It’s equivalent to: function(){ return Number(new Date); } See http://xkr.us/articles/javascript/unary-add and MDN.
I’ve been looking for better way of doing it recently. Associative array sounded like overkill for me. Look what I found: suffix=bzz declare prefix_$suffix=mystr …and then… varname=prefix_$suffix echo ${!varname} From the docs: The ‘$’ character introduces parameter expansion, command substitution, or arithmetic expansion. … The basic form of parameter expansion is ${parameter}. The value of … Read more
x = getattr(self, source) will work just perfectly if source names ANY attribute of self, including the other_data in your example.
The % (modulo) operator yields the remainder from the division of the first argument by the second. The numeric arguments are first converted to a common type. A zero right argument raises the ZeroDivisionError exception. The arguments may be floating point numbers, e.g., 3.14%0.7 equals 0.34 (since 3.14 equals 4*0.7 + 0.34.) The modulo operator … Read more
It is called the Conditional Operator (which is a ternary operator). It has the form of: condition ? value-if-true : value-if-false Think of the ? as “then” and : as “else”. Your code is equivalent to if (max != 0) hsb.s = 255 * delta / max; else hsb.s = 0;
All string literals can be broken across several lines; for example: let string = “line one line two”; is a two line string, the same as “line one\nline two” (of course one can use the \n newline escape directly too). If you wish to just break a string across multiple lines for formatting reasons you … Read more
db.messages.find( { headers : { From: “reservations@marriott.com” } } ) This queries for documents where headers equals { From: … }, i.e. contains no other fields. db.messages.find( { ‘headers.From’: “reservations@marriott.com” } ) This only looks at the headers.From field, not affected by other fields contained in, or missing from, headers. Dot-notation docs