merge the json arrays without duplicate

Question

how to merge this array without duplicate?

students1=[{studentId: "0001", name: "Joe", class: "1"},{studentId: "0002", name: "john", class: "1"},{studentId: "0003", name: "Max", class: "1"}];

students2=[{studentId: "0001", name: "Joe", class: "1"},{studentId: "0002", name: "john", class: "1"},{studentId: "0003", name: "Max", class: "1"},{studentId: "0004", name: "Jony", class: "1"}];

allStudents=$.merge(students1,students2);

Possible Duplicate: https://stackoverflow.com/questions/1584370/how-to-merge-two-arrays-in-javascript-and-de-duplicate-items — Rajesh, Jan 29 '18 at 05:21
Possible duplicate of [How to merge two arrays in JavaScript and de-duplicate items](https://stackoverflow.com/questions/1584370/how-to-merge-two-arrays-in-javascript-and-de-duplicate-items) — Aluan Haddad, Apr 24 '18 at 04:40

score 3 · Accepted Answer · edited Apr 24 '18 at 04:38

3

You can array#concat both arrays and then use array#reduce to get the unique values from both arrays.

const students1=[{studentId: "0001", name: "Joe", class: "1"},{studentId: "0002", name: "john", class: "1"},{studentId: "0003", name: "Max", class: "1"}],
      students2=[{studentId: "0001", name: "Joe", class: "1"},{studentId: "0002", name: "john", class: "1"},{studentId: "0003", name: "Max", class: "1"},{studentId: "0004", name: "Jony", class: "1"}],
      allstudents = Object.values(students1.concat(students2).reduce((r,o) => {
        r[o.studentId] = o;
        return r;
      },{}));
console.log(allstudents);

edited Apr 24 '18 at 04:38

Aluan Haddad

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answered Jan 29 '18 at 05:23

Hassan Imam

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Did you try to look for dupe? – Rajesh Jan 29 '18 at 05:34
Thank you friend it is helpful – vijay Jan 29 '18 at 05:57
@Hassan this will not work on IE 11 or lower due to `=>` expressions. Any code available for ES5 ? – vibs2006 Apr 24 '18 at 04:41

merge the json arrays without duplicate

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