associative-array

问题 Suppose I have two files: file1 - map.txt 1, 178246 2, 289789 3, 384275 4, 869282 file2 - relation.txt 178246, 289789 384275, 178246 384275, 869282 Expected results are: 1, 2 3, 1 3, 4 But the results I got using the following code were: awk 'FNR==NR{map[$2]=$1} {$1=map[$1];$2=map[$2];print $0}' map.txt relation.txt 2, 1, 4, It was confused when I swapped the columns in map.txt like this: 178246, 1 289789, 2 384275, 3 869282, 4 relation.txt doesn't change The results became: awk 'FNR==NR{map[

问题 Coming from PHP background I could do this in PHP: $array[sales_details][uid] = 1; $array[sales_details][name] = "Name Surname"; $array[sales_details][sales][France][Paris] = 50; $array[sales_details][sales][France][Lyon] = 25; $array[sales_details][sales][UK][London] = 75; $array[sales_details][sales][German][Berlin] = 23; How can I do this in C#? I tried looking into Dictionary. But even if I define the value key as object it will not accept the "sales" array. var dict = new Dictionary

问题 I have an array that looks something like this: Array ( [0] => apple ["b"] => banana [3] => cow ["wrench"] => duck ) I want to take that array and use array_filter or something similar to remove elements with non-numeric keys and receive the follwoing array: Array ( [0] => apple [3] => cow ) I was thinking about this, and I could not think of a way to do this because array_filter does not provide my function with the key, and array_walk cannot modify array structure (talked about in the PHP

问题 Can a string be used as array index in C? Ex: String Corresponding value "ONE" 1 "TWO" 2 "FIVE" 5 "TEN" 10 When a string in the above list is passed to the function, the function must return the corresponding value indicated above. Can this be achieved by declaring a constant array with string as index int *x; x["ONE"] = 1; x["TWO"] = 2; x["FIVE"] = 5; x["TEN"] = 5; return x["string received by the function"]; The above logic does not work as expected; is there a workaround to implement the

问题 Can a string be used as array index in C? Ex: String Corresponding value "ONE" 1 "TWO" 2 "FIVE" 5 "TEN" 10 When a string in the above list is passed to the function, the function must return the corresponding value indicated above. Can this be achieved by declaring a constant array with string as index int *x; x["ONE"] = 1; x["TWO"] = 2; x["FIVE"] = 5; x["TEN"] = 5; return x["string received by the function"]; The above logic does not work as expected; is there a workaround to implement the

问题 I am creating a set of arrays with the following loop: $assessmentArr = explode("&", $assessmentData); foreach($assessmentArr as $data) { $fullArr = explode("_", $data); // Break down to only archetype and value $resultArr = explode("=", $fullArr[2]); //print_r($resultArr); } Which produces the following results: Array ( [0] => community-support [1] => 24 ) Array ( [0] => money-rewards [1] => 30 ) Array ( [0] => status-stability [1] => 15 ) Array ( [0] => personal-professional-development [1]

问题 This question already has answers here : Incompatible types List of List and ArrayList of ArrayList (6 answers) Initialize List<List<Integer>> in Java (2 answers) Closed 2 years ago . I want to understand the difference between the two definitions and why the correct one is correct and the wrong is wrong. The one showing me the compile-error List<List<Integer>> arr2 = new ArrayList<ArrayList<Integer>>(); The error it gave me : try2.java:8: error: incompatible types: ArrayList<ArrayList

问题 The key of the associative array is dynamically generated. How do I get the "Key" of such an array? $arr = array ('dynamic_key' => 'Value'); I am aware that It is possible to access it through a foreach loop like this: foreach ($arr as $key => $val) echo "Key value is $key"; However, I know that this array will have only one key and want to avoid a foreach loop. Is it possible to access the value of this element in any other way? Or get the key name? 回答1: edit: http://php.net/each says: each

问题 I've written a script that uses associative arrays in bash (v 4). It works fine on my local machine which is using 4.1.5(1)-release . On the production machine, using 4.1.0(1)-release the following line, which declares the assoc array, fails: declare -A uniqjars with the message: /script.sh: line 11: declare: -A: invalid option declare: usage: declare [-afFirtx] [-p] [name[=value] ...] I was under the impression this was a general bash 4 feature? In the man for bash on the production machine

问题 I have the following constant in my AngularJS app and want to access its values using the function shown below. Problem is that I pass the key as string but obviously as shown in the code below it returns undefined, so I was wondering is there a way I can convert the string passed to constant key in order to return the correct constant value corresponding to the key being passed? Thanks myApp.constant('clients', { clientData: "clientDetails", clientList: "clients" }); getConstV : function(Key