A very simple Category on NSArray will allow you to use map as seen in other languages @interface NSArray (Functional) -(NSArray *)map:(id (^) (id element))mapBlock; @end @implementation NSArray (Functional) -(NSArray *)map:(id (^)(id))mapBlock { NSMutableArray *array = [@[] mutableCopy]; for (id element in self) { [array addObject:mapBlock(element)]; } return [array copy]; } @end Now you can … Read more
This may be of use, excerpt: CatNames.instance = null; // Will contain the one and only instance of the class // This function ensures that I always use the same instance of the object CatNames.getInstance = function() { if (CatNames.instance == null) { CatNames.instance = new CatNames(); } return CatNames.instance; } Note: you should not … Read more
You can reformulate the question y = sqrt(x) as to find the value for y such that y*y – x equals zero. The easiest way to solve that equation is by doing a bisection on y (http://en.wikipedia.org/wiki/Bisection_method) between 0 and x (because 0 <= sqrt(x) <= x for all real numbers x where x should … Read more
This meets the stated requirement (last full week of previous two months): SET DATEFIRST 1; DECLARE @s DATE = GETDATE(), @s1 DATE, @s2 DATE; SET @s = GETDATE(); — last day of last month: SET @s1 = DATEADD(DAY, -DAY(@s), @s); — last day of previous month: SET @s = DATEADD(MONTH, -1, @s); SET @s2 = … Read more
You will need to include file1.h and file2.h in file3.h instead of file3.c. As func3 uses struct1 and struct2, you can’t declare it without having the declarations of the structs on hand. Don’t be tempted to redeclare the structs in file3.h. solved Declaring a function in a header file which references structs defined in different … Read more
You need to group by both month and year parts of ad.xDate. There are only twelve months of the year and you should be seeing the earliest two (14 – 2) month of your results with totals that are too large because they actually represent a combination of two calendar months. It worked in your … Read more
You can achieve this by using the javascript function getTime(). Code: var a = new Date(); alert(a.getTime()); Working Example According to getTime() definition: The getTime() method returns the numeric value corresponding to the time for the specified date according to universal time. More can be found in this link UPDATE: If you want to have … Read more
You don’t have to use the shell for redirection, you can just let Go do it: package main import ( “os” “os/exec” ) func main() { f, e := os.Create(“requirements.txt”) if e != nil { panic(e) } defer f.Close() c := exec.Command( “docker”, “exec”, “-it”, “demoContainer”, “bash”, “-c”, “pip freeze”, ) c.Stdout = f c.Run() … Read more
Change the following from root :to => “BookmarksController#index” to this root :to => “bookmarks#index” Look at these tutorials http://tryruby.org/ http://railsforzombies.org/ 3 solved Ruby on Rails tutorial part two
1. while ((buffer[i++] = getchar()) != ‘\n’) You have to be sure that the number of characters being entered is less than 4096. Else you have a buffer overflow. While reading until the end of the line it would be better to use fgets() which is much safer. 2. strcpy(newbuffer,buffer); What if your array buffer … Read more
The code is probably intended to create an identity matrix with 1’s on the leading diagonal and 0’s elsewhere. The Fortran equivalent of that code is used as the first example of bad code in the classic Elements of Programming Style by Kernighan and Plauger. Working from memory, the Fortran code was roughly: DO 10 … Read more
def traverse(tree_of_lists): for item in tree_of_lists: if isinstance(item, list): for x in traverse(item): yield x else: yield item This is the “basic” solution — can run in Python 2.7 and gives you an iterable that you can simply loop on. (In recent Python 3.* versions you’d use yield from item instead of the inner for … Read more
Your main method has to have the signature public static void main(String[] args) meaning you can’t mark it as returning a boolean. I don’t know what the point of this is but if you need it to return a boolean you should make another method to return a boolean. Your method needs to have he … Read more
The code int x = (2, 6, 8); uses the (very uncommon) comma operator. In C, an expression of the form expr1, expr2, expr3, …, exprN is interpreted to mean “evaluate expr1 and discard its value, then evaluate expr2 and discard its value, …, and finally evaluate exprN and use the value it evaluates to.” … Read more
try something like this. $set = array( 7, 8 ); echo ‘<pre>’; foreach( $set as $number ){ //assuming number is your INT $array = range( 1, $number ); while( count( $array ) ){ echo “\n”; var_export( $array ); //remove first element array_shift( $array ); //remove last element array_pop($array); } } Outputs: For 7 array ( … Read more