I currently have a WebSocket between JavaScript and a server programmed in C#. In JavaScript, I can pass data easily using an associative array: var data = {‘test’: ‘val’, ‘test2’: ‘val2′}; To represent this data object on the server side, I use a Dictionary<string, string>, but this is more ‘typing-expensive’ than in JavaScript: Dictionary<string, string> … Read more
In C/C#/etc. you can tell the compiler that a literal number is not what it appears to be (ie., float instead of double, unsigned long instead of int): var d = 1.0; // double var f = 1.0f; // float var u = 1UL; // unsigned long etc. Could someone point me to a list … Read more
Technically, any odd number of backslashes, as described in the documentation. >>> r’\’ File “<stdin>”, line 1 r’\’ ^ SyntaxError: EOL while scanning string literal >>> r’\\’ ‘\\\\’ >>> r’\\\’ File “<stdin>”, line 1 r’\\\’ ^ SyntaxError: EOL while scanning string literal It seems like the parser could just treat backslashes in raw strings as … Read more
Typically, I’ve seen people use the class literal like this: Class<Foo> cls = Foo.class; But what if the type is generic, e.g. List? This works fine, but has a warning since List should be parameterized: Class<List> cls = List.class So why not add a <?>? Well, this causes a type mismatch error: Class<List<?>> cls = … Read more
-2147483648 is the smallest integer for integer type with 32 bits, but it seems that it will overflow in the if(…) sentence: if (-2147483648 > 0) std::cout << “true”; else std::cout << “false”; This will print true in my testing. However, if we cast -2147483648 to integer, the result will be different: if (int(-2147483648) > … Read more
If I have a method void f(byte b); how can I call it with a numeric argument without casting? f(0); gives an error. 6 Answers 6
Given by a colleague as a puzzle, I cannot figure out how this C program actually compiles and runs. What is this >>>= operator and the strange 1P1 literal? I have tested in Clang and GCC. There are no warnings and the output is “???” #include <stdio.h> int main() { int a[2]={ 10, 1 }; … Read more
“foo” instanceof String //=> false “foo” instanceof Object //=> false true instanceof Boolean //=> false true instanceof Object //=> false false instanceof Boolean //=> false false instanceof Object //=> false 12.21 instanceof Number //=> false /foo/ instanceof RegExp //=> true // the tests against Object really don’t make sense Array literals and Object literals match… … Read more
How do you express an integer as a binary number with Python literals? I was easily able to find the answer for hex: >>> 0x12AF 4783 >>> 0x100 256 and octal: >>> 01267 695 >>> 0100 64 How do you use literals to express binary in Python? Summary of Answers Python 2.5 and earlier: can … Read more
In order to work with decimal data types, I have to do this with variable initialization: decimal aValue = 50.0M; What does the M part stand for? 5 Answers 5
