javascript - JS - Deleting unnecessary objects inside a list of objects -


i have object inside node server contains thousands of objects, each object person , has totalscore. looks this:

var mainobject = { //it's unsorted, no need sort anyway     john: {totalscore: 5, info: "no"},     james: {totalscore: 3, info: "no"},     lee: {totalscore: 55, info: "no"} }

now, want remain 1000 objects inside mainobject, problem need wipe lowest scores delete mainobject[name] before sending client(other solution other delete acceptable).

the indexes of each object inside mainobject shouldn't switched 1 another(there reason), lowest scores need go , list should sent client object , @ 1000 length.

you're attempting apply array-based concepts length , ordering object. won't do.

to achieve want, you're going have convert object array. 1 way so:

var mainobject = {      john: {totalscore: 5, info: "no"},      james: {totalscore: 3, info: "no"},      lee: {totalscore: 55, info: "no"},  };    var mainarray = object.keys(mainobject).map(function (name) {    return object.assign({}, mainobject[name], {name});  });    console.log(mainarray);

you can sort array score , return n highest entries:

var mainarray = [    {      "totalscore": 5,      "info": "no",      "name": "john"    },    {      "totalscore": 3,      "info": "no",      "name": "james"    },    {      "totalscore": 55,      "info": "no",      "name": "lee"    }  ]    mainarray.sort(function (a, b) {    return b.totalscore - a.totalscore;  });    console.log(mainarray.slice(0, 1000));

if reason client absolutely needs object rather array of objects, can convert back:

var mainarray = [    {      "totalscore": 5,      "info": "no",      "name": "john"    },    {      "totalscore": 3,      "info": "no",      "name": "james"    },    {      "totalscore": 55,      "info": "no",      "name": "lee"    }  ];    var mainobject = mainarray.reduce(function (prev, curr) {    var name = curr.name;    delete curr.name;    prev[name] = curr;    return prev;  }, {});    console.log(mainobject);

but @ point you've done absurd amount of work achieve goal. enough work implies an xy problem, , should reconsider decisions have led point.


Comments

Post a Comment

Popular posts from this blog

sql server - Cannot query correctly (MSSQL - PHP - JSON) -

i have little problem on project. , turns out query result returns nothing when value of first name or last name has 'ñ' in it. here's code config.php: <?php ini_set('mssql.charset', 'utf-8'); header('content-type: text/html; charset=utf-8'); $servername = "192.168.1.21"; /* ip add of db server */ $connection = array("database" => "db", "uid" => "?", "pwd" => "***"); $conn = sqlsrv_connect($servername, $connection); if(!$conn){ echo "connection not established."; die(print_r(sqlsrv_errors(), true)); } ?> myquery: $idnumber = $_post["idnum"]; $response = array(); $query2 = "select clname, cfname, cmname, cqualifier student cidno = '$idnumber'"; try{ $stmt2 = sqlsrv_query($conn, $query2); } catch(pdoexeption $ex){ $response["success"] = 0; $response["message"] = "d...
Read more

php - trouble displaying mysqli database results in correct order -

i have table in database stores events , date expire. want display events on website display current events first expired events after? i have tried following sql $sql = "select noticeid, notice, noticedesc, noticeimg, noticedate, expirydate tbl_notices group noticeid ,expired order expirydate asc"; but returns expired results first due expirydate being ordered asc in query. my tbl_notice structure looks this noticeid => int(4) notice => varchar(100) noticedesc => text noticedate => timestamp noticeimg => varchar(40) expirydate => datetime expired => int(1) 0 current or 1 expired my php code is $sql = "select noticeid, notice, noticedesc, noticeimg, noticedate, expirydate tbl_notices group noticeid ,expired order expirydate asc"; $result = mysqli_query($conn,$sql); if ($result->num_rows > 0) { // output data of each row while($row = $result->fetch_assoc()) { ...
Read more

C++ Linked List -

i trying create linked list download txt file , use linked list handle file line line. when handling downloaded linked list operations performed on such text editor would. encountering problems however. seems "node(string value)" section of code has wrong though original node() declaration no arguments passes. unable figure out quite is. node.h class node { public: node(); node(string value); void setnext(node *nextnode); // allows user set "next" pointer of node points friend class linkedlist; private: string data; // data box node* next; // pointer box }; node.cpp # include <string> # include "node.h" using namespace std; node::node() { data = ""; next = null; } node::node(string value) { data = value; next = null; } void node::setnext(node *nextnode) // allows user set "next" pointer of node points { this->next = nextnode; } your #include <string> ...
Read more