combine two arrays in Javascript/react

Question

i am trying to combine two arrays, i tried this:
const admin_navigation = [...AdminNav, ...initialNav] - not working right its over writing one array
i also tried, const admin_navigation = AdminNav.concat(initialNav); - give me an error (TypeError: AdminNav.concat is not a function)

what i am trying to create is one array that combine both arrays into one like the bottom example.

=== Array 1 ===

const initialNav = {
  items: [
    {
      name: "Test Page",
      url: "/test/testpage",
      icon: "icon-drop",
    },
    {
      name: "Test Page2",
      url: "/test/testpage2",
      icon: "icon-drop",
    },
  ],
};

=== Array 2 === (comes from my reducer)

const AdminNav = {
  items: [
    {
      title: true,
      name: "ADMINISTRATOR22",
      wrapper: {
        // optional wrapper object
        element: "", // required valid HTML5 element tag
        attributes: {}, // optional valid JS object with JS API naming ex: { className: "my-class", style: { fontFamily: "Verdana" }, id: "my-id"}
      },
      class: "", // optional class names space delimited list for title item ex: "text-center"
    },
    {
      name: "Forms",
      url: "/base/forms",
      icon: "icon-puzzle",
    },
  ],
  //loading: false,
};

i need the results to be like this:

const NewNav = {
  items: [
    {
      title: true,
      name: "ADMINISTRATOR22",
      wrapper: {
        // optional wrapper object
        element: "", // required valid HTML5 element tag
        attributes: {}, // optional valid JS object with JS API naming ex: { className: "my-class", style: { fontFamily: "Verdana" }, id: "my-id"}
      },
      class: "", // optional class names space delimited list for title item ex: "text-center"
    },
    {
      name: "Forms",
      url: "/base/forms",
      icon: "icon-puzzle",
    },
    {
      name: "Test Page",
      url: "/test/testpage",
      icon: "icon-drop",
    },
    {
      name: "Test Page2",
      url: "/test/testpage2",
      icon: "icon-drop",
    },
  ],
};

i tried....const admin_navigation = [...AdminNav, ...initialNav] - not working right its over writing one array i also tried, const admin_navigation = AdminNav.concat(initialNav); - give me an error (TypeError: AdminNav.concat is not a function) — Alan911B
– Alan911B, Commented May 9, 2020 at 17:19

helloitsjoe · Accepted Answer · 2020-05-09 17:19:38Z

3

initialNav and AdminNav are objects, not arrays. You want this instead:

const NewNav = { items: [...initialNav.items, ...AdminNav.items] };

answered May 9, 2020 at 17:19

helloitsjoe

6,5393 gold badges24 silver badges34 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

chiragrtr · Accepted Answer · 2020-05-09 17:20:14Z

1

Use spread operator or concat over the arrays:

const NewNav = {
    items: [...AdminNav.items, ...initialNav.items]
};

answered May 9, 2020 at 17:20

chiragrtr

9324 silver badges6 bronze badges

Comments

Venky4c · Accepted Answer · 2020-05-09 17:22:16Z

0

You can use the concat method which basically combines two existing arrays and creates a new one like this:

let firstNumbers = [1, 2, 3];
let secondNumbers = [4, 5, 6];
let merged = firstNumbers.concat(secondNumbers);
console.log(merged); // [1, 2, 3, 4, 5, 6]

answered May 9, 2020 at 17:22

Venky4c

114 bronze badges

Comments

Vignesh Rathnam · Accepted Answer · 2020-05-09 17:32:55Z

0

You're trying to iterate the objects into an array.

try

const admin={...NewNav,...initialNav}

answered May 9, 2020 at 17:32

Vignesh Rathnam

417 bronze badges

Comments

Mickael B. · Accepted Answer · 2020-05-10 00:57:34Z

0

You can try using concat function also, which will return the result

const items  = AdminNav.items.concat(initialNav.items)

edited May 10, 2020 at 0:57

Mickael B.

5,2454 gold badges28 silver badges53 bronze badges

answered May 9, 2020 at 17:21

ravi

1,1559 silver badges10 bronze badges

Collectives™ on Stack Overflow

combine two arrays in Javascript/react

5 Answers 5

Comments

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related