Javascript sorting of null values to be considered -


i have array of objects has null values similar 1 below

let customerdata = [{         id: 1,         name: 'cust1',         address: null     },     {         id: 2,         name: 'cust2',         address: 'test1'     },     {         id: 3,         name: 'cust3',         address: 'add2'     },     {         id: 4,         name: 'cust4',         address: 'test2'     },     {         id: 5,         name: 'cust5',         address: null     } ];

in asc/desc null values sorted @ last.can please me sort null values also?either move null values top when asc/desc.

if replace null values blank, sorting works expected.but cannot change data empty null , empty values treated differently.

i have seen many similar posts of them making null values push below links below.

how sort array null values

please dont mark question duplicate couldn't find proper solution.

the solutions have tried

 data.sort(function (item1, item2) {     ------------------/////---not working------------------------------ if (item1[colbinding] === null && sort.direction === 'asc') return 1; if (item2[colbinding] === null && sort.direction === 'asc') return 0; if (item1[sort.colbinding] === null && sort.direction === 'desc') return 1;                if (item2[sort.colbinding] === null && sort.direction === 'desc') return -1; if (sort.direction === 'asc') return item1[sort.colbinding] > item2[sort.colbinding]; if (sort.direction === 'desc') return item1[sort.colbinding] < item2[sort.colbinding];   ------------------------------------------------------- ----------------------//working push null @ end  let currentdata = item1[colbinding] === null ? '' : item1[sort.colbinding]; let nextdata = item2[sort.colbinding] === null ? '' : item2[sort.colbinding]; if (currentdata === nextdata) { return -1 }; if (currentdata < nextdata) { return 0 }; if (currentdata > nextdata) { return 1 };  ----------------------------------------------------------  ---------------------/// not working----------------------------------- var nullposition = sort.direction === 'asc' ? 1 : -1; if (item1[colbinding] === null) return nullposition; if (item2[colbinding] === null) return -nullposition; if (item1[colbinding] < item2[colbinding]) return -nullposition; if (item1[colbinding] > item2[colbinding]) return nullposition; return 0 ------------------------------------------------------------------------------                  });

you check value null first , sort them top, sort value.

var data = [{ id: 1, name: 'cust1', address: null }, { id: 2, name: 'cust2', address: 'test1' }, { id: 3, name: 'cust3', address: 'add2' }, { id: 4, name: 'cust4', address: 'test2' }, { id: 5, name: 'cust5', address: null }];    data.sort(function (a, b) {      return (b.address === null) - (a.address === null) || ('' + a.address).localecompare(b.address);  });    console.log(data);
.as-console-wrapper { max-height: 100% !important; top: 0; }

for descending sort, reverse second part

var data = [{ id: 1, name: 'cust1', address: null }, { id: 2, name: 'cust2', address: 'test1' }, { id: 3, name: 'cust3', address: 'add2' }, { id: 4, name: 'cust4', address: 'test2' }, { id: 5, name: 'cust5', address: null }];    data.sort(function (a, b) {      return (b.address === null) - (a.address === null) || ('' + b.address).localecompare(a.address);  });    console.log(data);
.as-console-wrapper { max-height: 100% !important; top: 0; }


Comments

Post a Comment

Popular posts from this blog

python - Operations inside variables -

this question has answer here: evaluating mathematical expression in string 12 answers i want make python script finds maximum possible output using 2 operations. problem says there syntax error @ 2nd last line, in b in there. how can fix it? x = 0 = int(input("1st number:")) c = int(input("2nd number:" )) e = int(input("3rd number:" )) in range(4): if == 0: b = "+" elif == 1: b = "-" elif == 2: b = "/" else: b = "*" j in range(4): if j == 0: d = "+" elif j == 1: d = "-" elif j == 2: d = "/" else: d = "*" k = b c d e print(k) if you're after variables e on single line, couldn...
Read more

Generic Map Parameter java -

i having lot of methods of type: public static list<eduusers> getdetails(class c, map<string, integer> params) { list<eduusers> details = null; session session = hibernateutil.getsessionfactory().opensession(); transaction tx = null; try { tx = session.begintransaction(); criteria cr = session.createcriteria(c); (map.entry<string, integer> entry : params.entryset()) { cr.add(restrictions.eq(entry.getkey(), entry.getvalue())); } details = cr.list(); tx.commit(); } catch (exception asd) { log.debug(asd.getmessage()); if (tx != null) { tx.commit(); } } { session.close(); } return details; } i trying have generic method them , have written far: public static <t> list<t> getdetails(class<t> c, class<t> b) { l...
Read more

arrays - What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it? -

what arrayindexoutofboundsexception mean , how rid of it? here code sample triggers exception: string[] name = {"tom", "dick", "harry"}; for(int = 0; i<=name.length; i++) { system.out.print(name[i] +'\n'); } your first port of call should documentation explains reasonably clearly: thrown indicate array has been accessed illegal index. index either negative or greater or equal size of array. so example: int[] array = new int[5]; int boom = array[10]; // throws exception as how avoid it... um, don't that. careful array indexes. one problem people run thinking arrays 1-indexed, e.g. int[] array = new int[5]; // ... populate array here ... (int index = 1; index <= array.length; index++) { system.out.println(array[index]); } that miss out first element (index 0) , throw exception when index 5. valid indexes here 0-4 inclusive. correct, idiomatic for statement here be: for (int index = 0; index <...
Read more