Because in Haskell, we have laziness & guarded recursion and tail call optimization and Perl has neither. This essentially means that every function call allocates a set amount of memory called “the stack” until the function returns. When you write recursive code, you build up a huge amount of memory because of these nested function … Read more
JObject jsonObject=JObject.Parse(theJsonString); IEnumerable<JToken> jTokens = jsonObject.Descendants().Where(p => !p.HasValues); Dictionary<string, string> results = jTokens.Aggregate(new Dictionary<string, string>(), (properties, jToken) => { properties.Add(jToken.Path, jToken.ToString()); return properties; }); I had the same requirement of flattening a nested json structure to a dictionary object. Found the solution here.
No matter what you do, you are going to have to unwind the stack. This leaves two options: Magic return value (as described by one of the Toms) Throw an exception (as mentioned by thaggie) If the case where you want things to die is rare, this may be one of those situations where throwing … Read more
While it is possible to use a recursive method here, you can traverse this tree structure using an explicit stack instead to avoid using the stack space, which isn’t always sufficient for large tree structures. Such a method is also very nice as an iterator block, and iterator blocks are much more expensive when recursive … Read more
Generate one random number and map it onto your desired ranges of numbers. If you wanted to generate an integer between 1-4 or 7-10, excluding 5 and 6, you might: Generate a random integer in the range 1-8 If the random number is greater than 4, add 2 to the result. The mapping becomes: Random … Read more
You can simply use the mkdirs() method of java.io.File class. Example: new File(“C:\\Directory1\\Directory2”).mkdirs();
The observed variance is caused by background JIT compilation. This is how the process looks like: Method f() starts execution in interpreter. After a number of invocations (around 250) the method is scheduled for compilation. The compiler thread works in parallel to the application thread. Meanwhile the method continues execution in interpreter. As soon as … Read more
You can’t access Function2 inside of it if it is in the line where you declare it. The reason is that you’re not referring to a function but to a variable (whose type is a function) and it will be accessible only after the declaration. Quoting from Spec: Declarations and scope: The scope of a … Read more
There’s nothing wrong with direct, “ad-hoc” solution. It can be clean enough too. Just notice that spiral is built from segments. And you can get next segment from current one rotating it by 90 degrees. And each two rotations, length of segment grows by 1. edit Illustration, those segments numbered … 11 10 7 7 … Read more
Think about the difference between the auto version and the fully specified type version. The auto keyword infers its type from whatever it’s initialized with, but what you’re initializing it with needs to know what its type is (in this case, the lambda closure needs to know the types it’s capturing). Something of a chicken-and-egg … Read more