What is the instanceof operator in JavaScript?
What is the instanceof operator in JavaScript? I saw this in a blog post by John Resig, and didn't understand what does it means in regular JavaScript code (without that library). ...
operators
What does the caret operator (^) in Python do?
I ran across the caret operator in python today and trying it out, I got the following output: >>> 8^3 11 >>> 8^4 12 >>> 8^1 9 >>> 8^0 8 >>> 7^1 6 >>> 7^2 5 >>> 7^7 0 >>> 7^8 15 >>> 9^1 8 >>> 16^1 17 >>> 15^1 14 >>> It seems to be based on 8, so I'm guessing some sort of byte operation? I can't seem to find much about this searching ...
How to assign the output of a command to a variable?
Hi, this is probably a very stupid question; in a bash script, given the output of, for instance; awk '{print $7}' temp it gives 0.54546 I would like to give this to a variable, so I tried: read ENE <<< $(awk '{print $7}' temp) but I get Syntax error: redirection unexpected Could you tell me why, and what is the easiest way t...
What does "!" mean in pseudo-code? I know "!" stands for factorial but I can't translate it
What does ! mean in pseudo-code? I know ! stands for factorial but I can't translate it . ex: get operation if (operation!= ’B’ OR operation != ’D’ OR operation!= ’W’) then print "Invalid Operation" What does it mean? Please help my mid-term is in hours :S Thanks in advance for your help :) ...
operator for enums
Hi all, Just out of curiosity, asking this Like the expression one below a = (condition) ? x : y; // two outputs why can't we have an operator for enums? say, myValue = f ??? fnApple() : fnMango() : fnOrange(); // no. of outputs specified in the enum definition instead of switch statements (even though refactoring is possible)...
Operator + for matrices in C++
I suppose the naive implementation of a + operator for matrices (2D for instance) in C++ would be: class Matrix { Matrix operator+ (const Matrix & other) const { Matrix result; // fill result with *this.data plus other.data return result; } } so we could use it like Matrix a; Matrix b; Matrix c; c = a + b; ...
Are +=, |=, &= etc atomic?
Are the "modify" operators like +=, |=, &= etc atomic? I know ++ is atomic (if you perform x++; in two different threads "simultaneously", you will always end up with x increased by 2, as opposed to x=x+1 with optimization switched off.) What I wonder is whether variable |= constant, and the likes are thread-safe or do I have to protec...
What is the "===" operator for?
I once encountered an operator "===". But I don remember what it was.. or where do we use it .. or is there any such a kind of operator ? where is it used ?? ...
Which namespace does operator<< (stream) go to?
If I have have some overloaded ostream operators, defined for library local objects, is its okay for them to go to std namespace? If I do not declare them in std namespace, then I must use using ns:: operator <<. As a possible follow-up question, are there any operators which should go to standard or global namespace? ...
What happens if "== operator is not defined"?
What happens if "== operator is not defined"? Example: class a { int variable = 0; } class b { void proc() { a ref1 = new a(); a ref2 = new a(); bool cmp1 = ref1 == ref2;//? bool cmp2 = ref1 == ref1;//? } } Does it differ when working with structs? How about marshaled (System.Runtime...
What does a fullstop or period or dot (.) mean in Haskell?
I really wish that Google was better at searching for syntax: decades :: (RealFrac a) => a -> a -> [a] -> Array Int Int decades a b = hist (0,9) . map decade where decade x = floor ((x - a) * s) s = 10 / (b - a) ...
meaning of '+='
I'm confused with the syntax of C#: what is the use of "+="? ...
What does "<<" mean in C#?
Basically the questions in the title. I'm looking at the MVC 2 source code: [Flags] public enum HttpVerbs { Get = 1 << 0, Post = 1 << 1, Put = 1 << 2, Delete = 1 << 3, Head = 1 << 4 } and I'm just curious as to what "<<" does. ...
Does this language feature already exist?
I'm currently developing a new language for programming in a continuous environment (compare it to electrical engineering), and I've got some ideas on a certain language construction. Let me explain the feature by explanation and then by definition: x = a U b; Where x is a variable and a and b are other variables (or static values). ...
Why isn't `"repeat" * 3` the same as `3 * "repeat"` in Ruby?
When I type this: puts 'repeat' * 3 I get: >> repeat repeat repeat But it's not working if I do this: puts 3 * 'repeat' Why? ...
parsing string according to oracle operators with regex
Hi, Basically I was trying to replace the part of string with its actual value which comes immediately after oracle operators. I can do this for limited operators list like {=,>,<} but I wonder that is there any way out to gather all the operators rather than giving them by hands? For instance, I have this string; "a = xyz", then I will...
What do you think about ??= operator in C#?
Do you think that C# will support something like ??= operator? Instead of this: if (list == null) list = new List<int>(); It might be possible to write: list ??= new List<int>(); Now, I could use (but it seems to me not well readable): list = list ?? new List<int>(); ...
How are operators called which affect the first operand instead of 'return' something?
Hello, everyone! I'm talking about operators which not return a value but modify (overwrite) the first operand. Example in pseudo-code: add := return op1 + op2 increment := op1 = op1 + op2 Given this mapping schema: add -> increment subtract -> decrement What could possibly be the names for other operators? multiply, d...
Shift Operators in C++
If the value after the shift operator is greater than the number of bits in the left-hand operand, the result is undefined. If the left-hand operand is unsigned, the right shift is a logical shift so the upper bits will be filled with zeros. If the left-hand operand is signed, the right shift may or may not be a logica...
Variable Operators in PHP
Given this example, how would I return the result of the equation rather than the equation itself as a string? $operator = '+'; foreach($resultSet as $item){ $result = $item[$this->orderField] . $operator . 1; echo $result; } ...