According to MSDN: Array usage guidelines: Array Valued Properties You should use collections to avoid code inefficiencies. In the following code example, each call to the myObj property creates a copy of the array. As a result, 2n+1 copies of the array will be created in the following loop. [Visual Basic] Dim i As Integer For i...
What would be the most efficient method of reading a text file into a dynamic one-dimensional array? reallocing after every read char seems silly, reallocing after every read line doesn't seem much better. I would like to read the entire file into the array. How would you do it? ...
[1, 1, 1, 2, 3] => 1 ['cat', 'dog', 'snake', 'dog'] => dog ...
I seem to run into this very often. I need to build a Hash from an array using an attribute of each object in the array as the key. Lets say I need a hash of example uses ActiveRecord objecs keyed by their ids Common way: ary = [collection of ActiveRecord objects] hash = ary.inject({}) {|hash, obj| hash[obj.id] = obj } Another Way: ...
I often use an ArrayList instead of a 'normal' array[]. I feel as if I am cheating (or being lazy) when I use an ArrayList, when is it okay to use an ArrayList over an array? ...
I'm looking for a kind of array data-type that can easily have items added, without a performance hit. System.Array - Redim Preserve copies entire RAM from old to new, as slow as amount of existing elements System.Collections.ArrayList - good enough? System.Collections.IList - good enough? ...
Basically I'm creating an indoor navigation system in J2ME. I've put the location details in a .txt file i.e. Locations names and their coordinates. Edges with respective start node and end node as well as the weight (length of the node). I put both details in the same file so users dont have to download multiple files to get their ma...
Basically I have a setup like the following: Array ( [0] => Array ( [0] => stdClass Object ( [nid] => 1 [title] => title1 [uid] => 1 [parent] => 0 [weight] => -15 [name] => name1 [value] => 0 ) [1] => stdClass Object ( [nid] => 2 [title] => title2 [uid] => 1 [parent] => 0 [weight] => -7 [name] => name2 [value] => 100 ) ...
I have 3 byte arrays in C# that I need to combine into one. What would be the most efficient method to complete this task? ...
I have a function (for ease, I'll just use count()) that I want to apply to maybe 4-5 different variables. Right now, I am doing this: $a = count($a); $b = count($b); $c = count($c); $d = count($d); Is there a better way? I know arrays can use the array_map function, but I want the values to remain as separate values, instead of value...
A friend has asked me to take a Flash 8.0 static image gallery website and make it dynamic. Most articles I've found for dynamic image galleries involve loading the images on request into an existing movieclip. I can't do this because there are some really neat transitions being used requiring both images to be available. I've figured ...
I have a pointer to pointer array. I am assigning each row in the while loop below and the printf inside the while loop shows each is assigned my id number 1-20. After, out side of the while loop I iterate through the array and every element is written with id 20? Any help is greatly appreciated. (FYI- I am using the Template2doc library...
Someone here recently pointed out to me in a piece of code of mine I am using char* name = malloc(256*sizeof(char)); // more code free(name); I was under the impression that this way of setting up an array was identical to using char name[256]; and that both ways would require the use of free(). Am I wrong and if so could someon...
I'm having a problem with my work that hopefully reduces to the following: I have two List<int>s, and I want to see if any of the ints in ListA are equal to any int in ListB. (They can be arrays if that makes life easier, but I think List<> has some built-in magic that might help.) And I'm sure this is a LINQ-friendly problem, but I'm ...
How can I deep copy an irregularly shaped 2D array in Java? Ie. int[][] nums = {{5}, {9,4}, {1,7,8}, {8,3,2,10}} I'm unable to use Arrays.arrayCopy() for some reason (versioning?) Thanks ...
Checkbox[,] checkArray = new Checkbox[2, 3]{{checkbox24,checkboxPref1,null}, {checkbox23,checkboxPref2,null}}; // I am getting error . How do I initialize it? ...
I have three arrays. @array1 containing filenames @array2 containing filenames @unique which I want to contain the unique items I use the following code to compare the two arrays and output a third array that contains the unique filenames. @test{@array1} = (); @unqiue = grep {!exists $test{$_}} @array2; However the output is case...
An idea I had to solve this, is to make up an buffer of size 8x8, fill it up with pointers to my checkers (all 20 of them), and the rest leave 0 (null), then run a shuffling algorithm on the buffer, and thats it (just read it as a 8x8 array) I was wondering if there's a better way to do this. I need to write it in C#, and my proposal w...
Hey guys, I am currently trying to learn C and I have come to a problem that I've been unable to solve. Consider: #include <stdio.h> #include <stdlib.h> #include <string.h> #define ELEMENTS 5 void make(char **array, int *array_size) { int i; char *t = "Hello, World!"; array = malloc(ELEMENTS * sizeof(char *)); for ...
I have a partially nfilled array of objects, and when I iterate through them I tried to check to see whether the selected object is null before I do other stuff with it. However, even the act of checking if it is null seem to through a NullPointerException. array.length will include all null elements as well. How do you go about checking...